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post #1 of 11 Old 07-28-2007, 03:28 PM Thread Starter
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help me make a twin turbo recipe!

I have access to a free Holset HX35W turbo. Unfortunately, I can't find one single web page with dimensions and specs for that turbo. Is there anybody who knows or knows where to find these specs, like the size and A/R info?

I'm planning on dropping a 351W in my newly aquired 95 body, I will have GT40P heads on it along with some kind of off the shelf cam.

I could either get that Holset turbo and find another one and use those for the twin setup, or get two turbos out of Tbird TC's and use those. I'm kind new to the turbo scene so any help would be greatly appreciated!


2003 Cobra - 2.3 Whipple, Return style fuel system, dual Walbro GSS342 pumps, Aeromotive FPR, SCT BA3000 MAF, Accufab TB, SRA conversion, 604 rwhp, 581 rwtq

1995 GT - H pipe and welded in Flowmasters. Stock otherwise.


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GT40 Aluminum heads, F-303 Cam, Holley Systemax intake, Procharger P600B kit 400 rwhp. Sold

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post #2 of 11 Old 07-29-2007, 11:09 AM Thread Starter
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I guess turbos are a mystery for everyone else too..


2003 Cobra - 2.3 Whipple, Return style fuel system, dual Walbro GSS342 pumps, Aeromotive FPR, SCT BA3000 MAF, Accufab TB, SRA conversion, 604 rwhp, 581 rwtq

1995 GT - H pipe and welded in Flowmasters. Stock otherwise.


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GT40 Aluminum heads, F-303 Cam, Holley Systemax intake, Procharger P600B kit 400 rwhp. Sold

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post #3 of 11 Old 07-29-2007, 08:12 PM
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I don't know about the holsets but the TCoupes turbos work just fine.

89'LX 306,T.W.heads,perf.intake,36's,stock cam/1.7's,70mmT.B.,T-56,3.27's,Twin 60/63 T3's intercooled,14psi,Evolution WG's, Meth inj.
579.2rwhp 658.6rwtq,[email protected] kicked off track
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post #4 of 11 Old 07-29-2007, 09:30 PM Thread Starter
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wow, your combo is awsome man! I guess I'll be getting two of the Tbird turbos. Would you happen to know how much those turbo coupe turbos are worth? Thanks!

2003 Cobra - 2.3 Whipple, Return style fuel system, dual Walbro GSS342 pumps, Aeromotive FPR, SCT BA3000 MAF, Accufab TB, SRA conversion, 604 rwhp, 581 rwtq

1995 GT - H pipe and welded in Flowmasters. Stock otherwise.


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GT40 Aluminum heads, F-303 Cam, Holley Systemax intake, Procharger P600B kit 400 rwhp. Sold

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post #5 of 11 Old 07-30-2007, 01:07 AM
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The HX35 is too small on a 302-351w you'll need two for twins. The HX40 will word great on a 302 but on the 351 will be close to maxing out if the engine is built at all (HCI) or your keepeing the boost low. The compressors on the Holsets are awesome and work really good, the turbine side is measured in cm 18, 22 ect and there is no real formula to convert to Garretts A/R I had a Holset HX40 that i was going to put on my 351 (383 stroker) but decided it was too small and sold it for twin TO4E 60 trims. I had a local turbo guru machine a .96 A/R Garrett turbine housing and wheel to put on the Holset.
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post #6 of 11 Old 07-30-2007, 12:27 PM
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You might consider some other heads for a 351. I think the P heads may be somewhat restrictive on there.
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post #7 of 11 Old 07-30-2007, 04:05 PM Thread Starter
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I'll do heads later, I may just go with some E7s that i'll work a little bit (because they are free!) and save the money I'd stick into GT40p's and go for some aluminums later on.

tackling two projects at once (351 swap and twin turbo) is a big job, so I want to keep it cost effective at first. I'm thinking about going with two turbos from turbo coupes, they're cheap and easy to find.

2003 Cobra - 2.3 Whipple, Return style fuel system, dual Walbro GSS342 pumps, Aeromotive FPR, SCT BA3000 MAF, Accufab TB, SRA conversion, 604 rwhp, 581 rwtq

1995 GT - H pipe and welded in Flowmasters. Stock otherwise.


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GT40 Aluminum heads, F-303 Cam, Holley Systemax intake, Procharger P600B kit 400 rwhp. Sold

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post #8 of 11 Old 07-31-2007, 07:37 AM
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Versus E7 heads, the GT40Ps are an upgrade for sure. I set up my system on E7s and then used GT40Ps so the plug angle should work for either. You may wind up using a different style of plug wire if you build on the P heads and then switch to a differnt plug angle. I'm using taylor 409 90 degree plugwires for the P heads and they are just awesome.
For the turbocoupe turbos, since you have more displacement, you should seek out the larger of the three versions: the .60/.63 garretts that were on manual trans cars before 87.
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post #9 of 11 Old 07-31-2007, 09:22 AM Thread Starter
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thanks for the info! I was looking at this ad in 5.0 magazine. The company is called Patriot Performance and they have some descent looking aluminum heads for 900 bucks.

2003 Cobra - 2.3 Whipple, Return style fuel system, dual Walbro GSS342 pumps, Aeromotive FPR, SCT BA3000 MAF, Accufab TB, SRA conversion, 604 rwhp, 581 rwtq

1995 GT - H pipe and welded in Flowmasters. Stock otherwise.


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GT40 Aluminum heads, F-303 Cam, Holley Systemax intake, Procharger P600B kit 400 rwhp. Sold

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There are two problems with the system. 1st is there are more parasites than hosts.... second, the parasites are allowed to vote.
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post #10 of 11 Old 07-31-2007, 11:05 AM
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putting small 302 heads on a 351 is just going to give
you a truck engine at best.

going to be horribly inefficient even with boost.

Save up and get same cast iron RHS 200
cheaper but still good flowing heads for a 351.

I'm going to be using twin T3/T4 garrets on mine
butt simple little turbos you can pick up for $500-700 each brand new.


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post #11 of 11 Old 07-31-2007, 02:37 PM Thread Starter
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Look, I've read where this guy installed a 72 351 long block with a custom intake into his car with twin T bird turbos and ran 10's in the quarter. I"m sure the heads on there were restrictive as hell compared to todays offerings, but it still made killer power.

I'm not looking for ALL the power a 351 based engine CAN make, I'm looking for twin turbo 302 power with the durability of the stronger 351. So if 302 heads will make 302 power, that's fine with me because I know plenty of 302's making 600 hp without a problem with twin turbos!

2003 Cobra - 2.3 Whipple, Return style fuel system, dual Walbro GSS342 pumps, Aeromotive FPR, SCT BA3000 MAF, Accufab TB, SRA conversion, 604 rwhp, 581 rwtq

1995 GT - H pipe and welded in Flowmasters. Stock otherwise.


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GT40 Aluminum heads, F-303 Cam, Holley Systemax intake, Procharger P600B kit 400 rwhp. Sold

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There are two problems with the system. 1st is there are more parasites than hosts.... second, the parasites are allowed to vote.
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