upgrading a 63mm to 76mm on stock blk - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 23 Old 03-11-2009, 07:45 PM Thread Starter
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upgrading a 63mm to 76mm on stock blk

hello all got a question..I have a stock bottom end 302 (with a cratel herd its #### though)63mm turbo and dfi.. Im getting alot of exhaust pressure ..i have a 76mm that i wanna install and if i keep the boost low am i gonna blow the motor..or how much boost.. or r.w.h max 550?

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post #2 of 23 Old 03-11-2009, 08:38 PM
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How do you know you have high back pressure?

What housing are you using on the ex side of the turbo?

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post #3 of 23 Old 03-11-2009, 08:50 PM Thread Starter
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How do you know you have high back pressure?

What housing are you using on the ex side of the turbo?
not sure as far as tec specs are concered but the out let is 2or 2 1/2 inch....

and the sound and dyno and dfi shows it
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post #4 of 23 Old 03-11-2009, 09:07 PM
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BOOM

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post #5 of 23 Old 03-11-2009, 09:22 PM Thread Starter
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BOOM
no way around it?
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post #6 of 23 Old 03-11-2009, 10:40 PM
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[QUOTE=NJMatt50;8622966]no way around it?[/QUOT



Anythings possible i think ud be ok with the right size combo wastgate downpipe etc! Do your homework!

Make sure u have an accurate boost controller! Very important especially on a stock block with a 76!

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post #7 of 23 Old 03-12-2009, 12:12 AM Thread Starter
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y

[QUOTE=ANGRY 5.0;8623320]
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no way around it?[/QUOT

thanks!fghjkl

Anythings possible i think ud be ok with the right size combo wastgate downpipe etc! Do your homework!

Make sure u have an accurate boost controller! Very important especially on a stock block with a 76!
thanks!!
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post #8 of 23 Old 03-13-2009, 02:28 PM
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You should have a 3" down pipe on your setup.

How do you kow you have high back pressure?

What is the A/R on your exhaust housing?
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post #9 of 23 Old 03-13-2009, 05:39 PM Thread Starter
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You should have a 3" down pipe on your setup.

How do you kow you have high back pressure?

What is the A/R on your exhaust housing?
the outlet on the turbos housing is 2 1/2 i think.. thats why im changing it all

my tuner guy Jobe from turbo people (one of the best) advised me of this problem...im more worried about putting the 76 on with 3 inch all the way around not sure which wastegate to get
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post #10 of 23 Old 03-14-2009, 01:35 PM
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I know a guy who ran around 10 psi (I think) with a Turbonetics T76 on a stock block. It was tuned by Turbo People with dfi as well.


Scotty we need more power!!!
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post #11 of 23 Old 03-14-2009, 02:08 PM
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anythings possible500-550rwhp making it last is another story!

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post #12 of 23 Old 03-23-2009, 09:02 PM
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Jobe knows more than we do so ask his advise. He is a turbo genius ,he can make it last
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post #13 of 23 Old 03-23-2009, 09:10 PM
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63mm is sized good for a stock 302
67mm is a little big for a stock motor
I would have probably made better numbers on the dyno with a 62mm. my .02

Stock block, GT40 heads, Explorer intake, 67mm, 10lbs, 431HP 497TQ on 110 octane. 12.01 @ 123
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post #14 of 23 Old 03-23-2009, 10:23 PM
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My 67mm seems to be doing well on my combo - I steer clear of dyno numbers so i'm not sure what it puts down now that everything is fixed.

Track numbers are a different story tho

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post #15 of 23 Old 03-24-2009, 09:15 AM
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I do not see why it would not be fine but as someone else said just do your homework or have Job do it for you. Just think the 3V guys with the Granetteli(sp?) kits are running T76 turbos on stock motors with less displacement than you have.

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post #16 of 23 Old 03-24-2009, 09:01 PM
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I know a guy with an 88 on a stock motor for a few years now. Its all in the tune up. Bigger wastegate maybe.
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post #17 of 23 Old 03-24-2009, 11:20 PM
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I ran a 76mm .96 a/r on my totally stock engine. I had a B&G turbo kit with 3.5" d/p , 44mm wastgate, 50mm BOV. I ran 7-11lbs of boost and with that large a/r i didnt hit boost until about 3700 rpm.
Tuneing is definatly key!
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post #18 of 23 Old 03-25-2009, 01:10 PM
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It's nice to see more than one member respect Job's advice.

With an VE map it's easy to see how the engine uses fuel. When they get into backpressure the fuel numbers get small in a hurry... There are other factors in this/cam/head flow...etc... On any 302 based engines with small turbos like 61/63 there is always choking on the other side of the tach. The next thing that comes into play is the on center turbine housings that some turbo kits come with. You can take that on center housing and put it right in the garbage can.

Yes the 05+ granatelli kit's come with 76mm's but they are on center and don't make respectable power, not to mention gate placement is horrible and boost creep vs power gains displays just how unimpressive that package works out.

The biggest issue you will have is keeping the mains in it. That turbo is going to start to gain steam over 12psi and your engine is out of hard parts. If Job is tuning it he will get it to live, but you need to make the step into a real engine program.

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post #19 of 23 Old 03-25-2009, 02:59 PM
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Seen a stock bottom end that should go 8's with a 76 and AOD. Its allready gone in the 5's in the 1/8 and coasted to 9's in te 1/4 when he ran out of gear. Its all in the tune.
DISCLAMER: chances are you are not going to make the 800hp this guy is making and live to tell about it. Basicly I am saying its a crapshot with the 63, may as well fix the issue(backpressure) and roll the dice again on the 76

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Last edited by Slither; 03-25-2009 at 03:16 PM.
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post #20 of 23 Old 03-25-2009, 03:06 PM
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Quote:
Originally Posted by Jay Meagher View Post

Yes the 05+ granatelli kit's come with 76mm's but they are on center and don't make respectable power, not to mention gate placement is horrible and boost creep vs power gains displays just how unimpressive that package works out.
True although did this guy here ever say if he was tang or on-center? I have never been in a 05+ with the granatelli kit but know a couple people online with them and are happy with how they perform on basically stock 3V. At least one of them though I think moved the wastegate and something else in the plumbing.

--Admiral Aaron

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post #21 of 23 Old 03-28-2009, 08:01 PM
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i ran a 76 on my car for a while with 14 psi no issues. stock non forged bottom end.

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post #22 of 23 Old 03-28-2009, 11:46 PM
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I'm putting a T76 on my blow thru carb 306 stock bottom end with a girdle. fast while it lasts!!!
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post #23 of 23 Old 03-30-2009, 10:54 AM
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Quote:
Originally Posted by Slither View Post
Seen a stock bottom end that should go 8's with a 76 and AOD. Its allready gone in the 5's in the 1/8 and coasted to 9's in te 1/4 when he ran out of gear. Its all in the tune.
DISCLAMER: chances are you are not going to make the 800hp this guy is making and live to tell about it. Basicly I am saying its a crapshot with the 63, may as well fix the issue(backpressure) and roll the dice again on the 76
Thats a brave man, I don't know that it's worth crashing your car or getting killed trying to go that fast on stock parts. At the point that the crank comes out of that think at 150 it's going to get ugly quick....

But you are correct in saying it's all in the tune. Keep the timing low, octane high and misfires out of the equation and it will live longer.

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