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Old 06-25-2009, 07:34 AM   #1
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Smile Dyno Numbers After GT40 Head Swap!!

Hey Corral, I finally got to Dez Racing yesterday to Dyno and tune my car. Here's what I did to it:

Swapped stock heads for GT40 Irons with 1.7 RR's and upgraded springs. Also added a 255 fuel pump, 24lb injectors with 75mm ProM, tossed the A/C.
Car still has stock cam and gt40intake is untouched.

263hp and 306ft/lb...
I'm thinking I'm right where I should be with my combo.
Let me know what your thoughts are and what my options are for some extra HP out of the intake over the winter. Thanks Corral.
Oh, and here's some pics of the build for the hell of it. Dyno vid coming soon.

STOCK:





EVERYTHING OFF:


NEW HEADS:




Also went ahead and painted the stock valvecovers:


Passenger Side:


Driver's:


Complete minus 75mm ProM:
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Old 06-25-2009, 07:50 AM   #2
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awsome #s.. thats what i made with almn gt-40s... i think something isnt right with mine...
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Old 06-25-2009, 07:56 AM   #3
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Thanks man. Yeah, Dez said we could probably get more out of them but it is my daily driver and I don't want to be dumping much more fuel through it just to pick up a couple more horses. It's currently running at 48 for fuel pressure. When we finished with the build, 99Exploder and I set the timing and fuel pressure just so that it would idle fine. Couldn't really tell what the timing was at because it was unreadable, but the fuel pressure was at 38. Got to Dez's and had only like 220 HP if that lol...Amazing what some fuel and correct timing will do.
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Old 06-25-2009, 08:48 AM   #4
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great #s for gt40 irons and a intake no doubt!!
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Old 06-25-2009, 08:54 AM   #5
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Quote:
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great #s for gt40 irons and a intake no doubt!!
i'd give the numbers a C for average...did you have a baseline before your swap?

but dyno numbers aren't that important, take it to the track.
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Old 06-25-2009, 09:28 AM   #6
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i'd give the numbers a C for average...did you have a baseline before your swap?

but dyno numbers aren't that important, take it to the track.
Gotta disagree i would go with a B above average for sure LOL im going with those #s are RWHP not HP if so ive seen honest dynos with similiar builds making alot less, as for HP i agree with out a doubt if anything im more impressed by torque #s but most of all ET. For example ive beaten more than 1 500 RWHP 03 cobra with alot less HP
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Old 06-25-2009, 09:32 AM   #7
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Nice numbers man!
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Old 06-25-2009, 09:35 AM   #8
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Numbers are RWHP and no I never dyno'd it stock. I probably had less than 200 RWHP before the heads, massair/injectors.
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Old 06-25-2009, 10:16 AM   #9
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Quote:
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Numbers are RWHP and no I never dyno'd it stock. I probably had less than 200 RWHP before the heads, massair/injectors.
Bet closers to 230 before heads,MA and injectors. I Made 230ish with Cobra intake,24lbs,Longtubes,76mm MA,65mm tb and ran a best of 12.89 @ 104
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Old 06-25-2009, 10:28 AM   #10
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Send the intake to tmoss.. clean up the exhaust bumps in the heads, and put a good cam in it over the winter and you'll really be having some fun!!
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Old 06-25-2009, 10:37 AM   #11
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Yeah, I plan on sending the lower to him over the winter. Will be speaking to him about it soon..
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Old 06-25-2009, 11:02 AM   #12
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Camshaft is really your next step. Pull the lower, send out for porting, while that is out, swap the cam. Re-Assemble and hit the track !
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Old 06-25-2009, 01:24 PM   #13
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Congrats! Seems right on the money for that setup.
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Old 06-25-2009, 01:43 PM   #14
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Where did your timing end up at ?
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Old 06-25-2009, 03:50 PM   #15
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That is an awesome combo.....
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Old 06-25-2009, 03:56 PM   #16
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Pretty good actually.

Just finished a build on a 308 with 9.5:1 comp GT-40 Irons and explorer intake. It did 265rwhp 300ftlbs. However it had an E-cam.

You're setup runs pretty dang good.
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Old 06-25-2009, 05:57 PM   #17
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Quote:
Originally Posted by 90Notch302 View Post
Hey Corral, I finally got to Dez Racing yesterday to Dyno and tune my car. Here's what I did to it:

Swapped stock heads for GT40 Irons with 1.7 RR's and upgraded springs. Also added a 255 fuel pump, 24lb injectors with 75mm ProM, tossed the A/C.
Car still has stock cam and gt40intake is untouched.

263hp and 306ft/lb...
I'm thinking I'm right where I should be with my combo.
Yeah, those numbers are in the ballpark for a GT40 set-up.
You might wanna put a heatshield around your air filter 'cause right now it'll be sucking in hot underhood air and that's not good for performance.
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Old 06-25-2009, 06:19 PM   #18
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Quote:
Originally Posted by 90Notch302 View Post
Thanks man. Yeah, Dez said we could probably get more out of them but it is my daily driver and I don't want to be dumping much more fuel through it just to pick up a couple more horses. It's currently running at 48 for fuel pressure. When we finished with the build, 99Exploder and I set the timing and fuel pressure just so that it would idle fine. Couldn't really tell what the timing was at because it was unreadable, but the fuel pressure was at 38. Got to Dez's and had only like 220 HP if that lol...Amazing what some fuel and correct timing will do.
wow...seems a little high for your set up.
i'm running the same base pressure.

oh...btw...nice numbers bro.
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Old 06-25-2009, 06:39 PM   #19
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What kind of tuning was done?
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Old 06-25-2009, 07:20 PM   #20
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man, when you can afford it, get a custom cam for your set up with a ported lower. I will bet you can get closer to the 290-300RWHP with stock like driveablity.
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Old 06-25-2009, 07:35 PM   #21
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Good job.
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Old 06-26-2009, 07:00 AM   #22
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Thanks everyone for the comments.
NotchAbove: Not sure if I wanna toss a cam in until I know what I plan on doing as far as power adders. Unless I can find one for cheap that is. I just don't want to have to swap cams more than once. Pretty sure timing is at 15.
Bullitt95: I'm gonna consider that heat shield thing.
kwikstang: That's what I thought too but Mike said if that's what it likes then just leave it like that.
privatejoker: Just basic fuel pressure and timing on the dyno.
onefastsvt: I know that my buddy 99Exploder(on here) has the same intake but ported and afr165's, custom cam and he made 306 rwhp I believe.

I think I'm gonna call Mike back and ask him about an issue I've been having since the tune. Whenever I'm cruising or getting on it and then I put the clutch in to slow down and brake to a stop, the car's rpm's just go straight down to 0 and the car dies. Can't figure out why. I'm thinking maybe a vaccuum leak? Anyone ever have the same problem?? Thanks again for all the replies.
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Old 06-26-2009, 08:37 AM   #23
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I think I'm gonna call Mike back and ask him about an issue I've been having since the tune. Whenever I'm cruising or getting on it and then I put the clutch in to slow down and brake to a stop, the car's rpm's just go straight down to 0 and the car dies. Can't figure out why. I'm thinking maybe a vaccuum leak? Anyone ever have the same problem?? Thanks again for all the replies.
It could be a vacuum leak but I had this problem once and it turned out that the TPS voltage was to low. I reset it and all was fine. Maybe this will help. BTW...really good #'s
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Old 06-26-2009, 08:56 AM   #24
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It could be a vacuum leak but I had this problem once and it turned out that the TPS voltage was to low. I reset it and all was fine. Maybe this will help. BTW...really good #'s
How do you reset the TPS? Thanks for the info.
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Old 06-26-2009, 10:26 AM   #25
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man, when you can afford it, get a custom cam for your set up with a ported lower. I will bet you can get closer to the 290-300RWHP with stock like driveablity.
He's not going to gain anywhere near 30rwhp with a cam change. He's be lucky to get 12rwhp from that so the remaining gains will have to come from porting the heads/intake.
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Old 06-26-2009, 10:52 AM   #26
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Take it to NED or LVD and see what it runs. My car makes almost the EXACT same power, 265/295.

For comparison sake.
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Old 06-26-2009, 11:13 AM   #27
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Take it to NED or LVD and see what it runs. My car makes almost the EXACT same power, 265/295.

For comparison sake.
Definitly heading up to NED some time soon hopefully. I hear you can run slicks now on Friday night street nights...

It ran a 13.4 with everything in my sig except for the 65mm TB, gt40 intake, e-fan, full suspension, long tubes and exhaust. I'm hoping for mid 12's with a good 60'.

BTW Brian47: GREAT POWER for E7's!!
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Old 06-26-2009, 11:18 AM   #28
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good job, nice numbers.
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Old 06-26-2009, 11:23 AM   #29
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Thanks!
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Old 06-26-2009, 01:18 PM   #30
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Im gonna go with your IAC on that stalling problem, on my car if i dont keep my idle at 1000 rpms i stall under same conditions, and i mean 100 less rpms will do it so if u got ur idle set at 800 rpms u might wanna try to raise it a little? Also every vacuum leak i ever had when i pushed in the clutch when slowing the idle would be to high
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Old 06-26-2009, 01:20 PM   #31
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very nice numbers I am sure the car is fun to drive
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Old 06-26-2009, 01:22 PM   #32
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Get the car dyno tuned and then leave it the hell alone. Best two decision you'll ever make.
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Old 06-26-2009, 01:41 PM   #33
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He's not going to gain anywhere near 30rwhp with a cam change. He's be lucky to get 12rwhp from that so the remaining gains will have to come from porting the heads/intake.
Where are you getting the 12rwhp from? Either way, with a tmoss port job / cam upgrade the 300RWHP is not out of reach.
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Old 06-26-2009, 02:27 PM   #34
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Originally Posted by 90Notch302 View Post
Definitly heading up to NED some time soon hopefully. I hear you can run slicks now on Friday night street nights...

It ran a 13.4 with everything in my sig except for the 65mm TB, gt40 intake, e-fan, full suspension, long tubes and exhaust. I'm hoping for mid 12's with a good 60'.

BTW Brian47: GREAT POWER for E7's!!
Thanks,

Mid 12s shouldn't be tough with that power. NED is also faster than LVD from my experience.
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89 LX: Stock cam, E7s, Cobra intake, 3.73s and bolt ons... BESTS
12.56 et 107.4 mph: slicks, 12.53 et 108.2 mph: 17" ET Streets, 12.87 et 111.5 mph: 17" DRs, 12.95 et 109.2 mph: 18" radials
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Old 06-26-2009, 03:36 PM   #35
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Thanks!
curious....what does your car weigh?
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