Full boost question

19BLACKGST98 · Dec 3, 2008

My car has been in the shop for about 4 months now due to one of my JE forged pistons not wanting to stay in one piece. I had some upgrades done to the car since it was already down. The car is put back together and running but I dont have it back yet due to some new things being tested on my ECU for Jeff (keydiver). Anyways I believe that I use to see full boost (21psi) on my FP3052 at 4000 rpm's (does that sound right...its been a while since ive driven it so I cant remember exactly). Some of my new upgrades involve a JM Fabrication intake manifold and an FP race exhaust manifold. My question is will those two upgrades hurt or help my spool time? (also there was some mild port and polish work done on the head...gasket matched to the intake manifold and cleaned up)

StavRedline · Dec 3, 2008

Almost all mods that increase volume of manifolds or posts will hurt spool time, but HOW much is the thing.

Theory is one thing, reality is the other, and to be fair, I doubt anything will even change to the extent you really feel it, and chances are the gains once on boost will outweigh the losses.

Quite often better manifolds do no good until a set level, and I'll be honest and say I dont know if you are at that level yet, but I know from experience the differences to spool time from running bigger manifolds are minimal.

Well, the only time I did notice a real difference was going from logs to long tube runners on a rear mount setup due to the massive extra heat loss, but that wont be a real issue on a conventional setup

bpe121212 · Dec 3, 2008

I noticed a slight improvement in spool especially between shifts on my GT BB 50 Trim when I changed from a stock 2G exhaust Manifold to the FP race Manifold.

I also noticed that the heat under the hood was less than I thought it would be with the FP manifold even though I no longer had the heat shield in place. I did however have the FP manifold ceramic coated.

StavRedline · Dec 3, 2008

bpe121212 said:
I did however have the FP manifold ceramic coated.

Got it in one there man :thumb:

Ceramic coated (if done well) means much more heat retention, which means much less radiated heat, and much more heat to spool turbos fast :thumb:

If you can afford it (and not too scared of the extra heat killing the manifold quicker- I'm not, many people are) ceramic coating or a good wrap is a winner in my eyes :thumb:

19BLACKGST98 · Dec 3, 2008

bpe121212 said:
I noticed a slight improvement in spool especially between shifts on my GT BB 50 Trim when I changed from a stock 2G exhaust Manifold to the FP race Manifold.

I also noticed that the heat under the hood was less than I thought it would be with the FP manifold even though I no longer had the heat shield in place. I did however have the FP manifold ceramic coated.

How much did it cost you to get it coated? Did they coat it before they sent it?

19BLACKGST98 · Dec 3, 2008

Are you talking about the same coating they are refering to? "We currently only have coated manifolds in stock. Once we have more uncoated manifolds available, we will update the website with the uncoated option. If you have any questions, please contact [email protected]"

If so mine is coated also

Brutus · Dec 3, 2008

I run a FP 3052 BB turbo also and I see full boost (28psi) at 3750rpm. So that sounds about right. I picked up a noticeable 250+ rpm quicker spool when I switched from stock 1G exhaust manifold to the coated FP race manifold. So you should see quicker spools as well, but the larger intake manifold may take some of that away, probably not enough to notice. You should hit full spool before 4 grand now.

19BLACKGST98 · Dec 3, 2008

Brutus said:
I run a FP 3052 BB turbo also and I see full boost (28psi) at 3750rpm. So that sounds about right. I picked up a noticeable 250+ rpm quicker spool when I switched from stock 1G exhaust manifold to the coated FP race manifold. So you should see quicker spools as well, but the larger intake manifold may take some of that away, probably not enough to notice. You should hit full spool before 4 grand now.

So after the race manifold you hit full boost at 3750rpm or do you hit it at 3500 now. Either way if it got anyfaster that would be great, but I would be happy if it even stayed the same. I also forgot to ad that I have a 75mm throttle body also so im guessing that would also hurt spool up?

StavRedline · Dec 4, 2008

19BLACKGST98 said:
I also forgot to ad that I have a 75mm throttle body also so im guessing that would also hurt spool up?

That shouldnt make any difference at all mate, only thing a larger TB can possibly do is make part throttle movments and fueling a little jumpier, but not anything you can really feel.

Sounds like your mods will work well

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