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Old 05-03-2009, 01:37 PM   #1
pete1122
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Default Cobb Pro-tune question....

I am about to get protuned by Cobb and I want to know what bolt on modification would yield the most gains with a pro-tune stage 2? If you had to only pick one which would benefit the most?
Bigger TMIC
Bigger fuel pump
Bigger injectors

I am currently running a PnP TD04, PnP Exhaust Manifolds with x-over pipe, Cobb Catted Downpipe, gutted uppipe and STI Catback.
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Old 05-04-2009, 01:11 AM   #2
pearljam11
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Definitely not fuel pump, you won't need that until you get a bigger turbo.
TMIC won't net you too much but its a good modification if you're planning on going for a bigger turbo later
Injectors honestly your stock injectors are more than capable for a 2.0L stock turbo application don't waste your money
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Old 05-04-2009, 07:06 AM   #3
Spenk
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^^^ I can't agree with anything in this post. A fuel pump is cheap insurance, and plenty of ppl have maxxed their stock injectors on Stage 2 tunes.

I did all of those mods with my P&P TD04 setup -- it was nice.

As far as which one by itself, I'd go for the bigger topmount, but only if you've got an appropriate splitter/bellows to match it.

Keeping heat out of the engine is always a good thing, no matter how much power you're making.

Last edited by Spenk; 05-04-2009 at 07:13 AM.
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Old 05-04-2009, 11:37 AM   #4
nme187
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Uppipe, didn't see that mentioned.
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Old 05-04-2009, 02:13 PM   #5
jnmarshall
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Picking from one of those three will most likely not yeild you any benefit alone.

Fuel pump, might be your first choice, but with stock injectors you would not use it's full potential. I don't think it would hurt anything.

Fuel injectors alone will not provide any benefits. You might actually have to get a custom tune to keep from running rich! The stock fuel pump may not be able match the flow rate!

A bigger TMIC would only be for show till you got a bigger turbo (and injectors and fuel pump). You car may actually be slower or lose power because your stock turbo will take longer to fill boost with the extra TMIC space.

I'd consider suspension or wheels for the next expense.
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Old 05-04-2009, 02:14 PM   #6
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Quote:
Originally Posted by nme187 View Post
Uppipe, didn't see that mentioned.
He lists a gutted uppipe.
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Old 05-04-2009, 05:35 PM   #7
pete1122
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Quote:
Originally Posted by Spenk View Post
^^^ I can't agree with anything in this post. A fuel pump is cheap insurance, and plenty of ppl have maxxed their stock injectors on Stage 2 tunes.

I did all of those mods with my P&P TD04 setup -- it was nice.

As far as which one by itself, I'd go for the bigger topmount, but only if you've got an appropriate splitter/bellows to match it.

Keeping heat out of the engine is always a good thing, no matter how much power you're making.
What sort of results did you see with your pro-tune with those mods? Spool up time? Peak boost? Hp numbers?
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Old 05-05-2009, 08:45 AM   #8
Spenk
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Spool time? Negligible -- Instaboost, dude. Even in 5th gear, point your toe at any RPM above 2500 and you're gone.

10psi@2100
14psi@2400
20.3psi@3150
held 19.4psi from 3300 to 5000
down to 16psi@6000
14psi@redline

Never had it dyno'd, but it had the low/mid-range throttle response and TQ of a small pushrod V8. Torque-steer in 1st gear.

That setup consisted of:
ported/coated TD04
Crucial catted DP
MadDad 3"-->2.5" tapered intermediate pipe
STi muff
PWR tmic
Prodrive Y-pipe
650 injectors
Walbro
BKR7E plugs
gutted OE UP
ported/coated manifolds
coated bigger x-over
MBC
low-temp T-stat
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Old 05-05-2009, 07:43 PM   #9
Travis@COBB
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Adding any of those parts will give you more insurance in your tune certainly, but with the exception of the intercooler, probably wont make too much more horsepower. There might be some gains to be had with a TMIC, but we arent talking 20hp here. Your limitation is the stock turbo pure and simple. An aggressively-tuned stage 2 STI is basically at the end of its fuel system, but can run happily all day long on stock injectors and stock fuel pump. If you plan on upgrading to a 16G at some point, you COULD install all those parts now and then be ready for the bigger turbo for the future, but they won't give you more power now.

Travis
COBB Tuning
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