I want torque and Mid-Range Power...screw top end.

[High PSI]

Long story short...my head is off my car (2g GSX). I'm gearing my engine mods to get more torque and mid-range power out of the engine, and I'll even sacrifice a little top end to do it.

After searching, I've decided that the stock 2g Head and IM is my best bet. However, I'm still torn on whether or not a slight clean-up of the head (such as a taboo stage 1 ) and an Extrude Hone of the Intake Manifold will hurt or help me. Cleaning up any inperfections will increase velocity (and torque), but if anything gets actually ported out (enlarged), velocity drops and my power shifts upwards. What should I do? Help from Wisemen is appreciated.

Oh yeah, biggest turbo I plan on running is a Big T28, and I'm probably going to throw in HKS 264's at the same time (after seeing some dyno charts that show how they increased power and tq over the ENTIRE RPM range).

 

[1fast97gsx]

leave your car stock and put a 16g on it with some 650s, safc2, fmic, 3" exhaust, 2g exhaust mani and that's about it ..

 

[kobykris]

Build a 2.4L then.

 

[Stapl3]

leave your car stock and put a 16g on it with some 650s, safc2, fmic, 3" exhaust, 2g exhaust mani and that's about it ..

650's for a 16g is rediculous.

 

[anconover]

id recommend 650's for a 16g as well actually. Better to have bigger than needed than to run out as long as u can compensate for em.

Build a 2.4l, or get a v8.

 

[High PSI]

leave your car stock and put a 16g on it with some 650s, safc2, fmic, 3" exhaust, 2g exhaust mani and that's about it ..

I've got a full 3" turbo back, ported 14B, ported 2g exhaust mani, and a Supra SMIC. I'm sending my computer out this week to get DSMLink once I decide what injectors to go with (deciding between 550's and 660's...biggest turbo I'll run is an EVO III 16G or a Big T28...only reason I'm leaning towards the 550's is because I can get them for half the price of the 660's), so I pretty much know what I'm doing with the rest of the car, I'm just undecided on the IM and the head.

 

[High PSI]

Build a 2.4L then.

Eventually, yeah, but that's not going to help me now. I just need to know if the Extrude Honing of the IM and cleaning up of the head will give me the power where I want it.

 

[Lee'sGSX]

650's for a 16g is rediculous.

Say's who????? 650-660s are perfect for the 16s. Hmmmm........................

 

[rsunahar]

id recommend 650's for a 16g as well actually. Better to have bigger than needed than to run out as long as u can compensate for em.

Build a 2.4l, or get a v8.

I agree. The last thing you want to skimp on a turbo car is the fuel system.
Nothing wrong with overkill when it comes to fuel.

 

[eclipse90gsxt]

550's for a 16G will be fine.

I ran that setup for 1 1/2 years on 18psi+

-Patrick

 

[High PSI]

550's for a 16G will be fine.

I ran that setup for 1 1/2 years on 18psi+

-Patrick

At what duty? I'm assuming that was with a FMIC as well...

 

[4g64GST]

I say there is not point in cleaning up a head and manifold unless you go all out with it. not worth the time and money IMO. I would maybe go oversized valves and be done with it.

 

[Lee'sGSX]

Yes 550s will work, but i would spend the extra few bucks and get the 660s . Why limit yourself. Add a front mount one day, then the cams one day, maybe some other things you 'MIGHT" do then you may be OK with 660s, but 550s I dunno. Just my thoughts been there done that!

 

[Mirage2LTurbo]

You should be able to buy just about any aftermarket injectors for the samce price. I paid $300 shipped for my 1680's

 

[eclipse90gsxt]

At what duty? I'm assuming that was with a FMIC as well...

I would have to dig up a log to find the dutcy cycle but its was, if I remember correctly, fine. If you plan to upgrade someday, just get 650's, 660's etc.

 

[1fast97gsx]

650's for a 16g is rediculous.

650 s are perfect for a 16g. Although the injectors will be nowhere near 100% duty cycle, you aren't limiting yourself to low boost and high duty cycle down the road and your timing curve will look better as well. Your MAF will see less airflow ( assuming an safc is used for tuning ) so your timing curve will look much better. If you are running dsmlink then 550s will do but once again why limit yourself? Maybe down the road a bigger turbo will come or a lot more boost?

 

[GPTourer]

Try out a new cam combo. 272in and 264ex.

I had thought if your injectors were too big, and you had to use major correction factors in your S-AFC, you'd get owned by not having enough timing advance to make max power. Maybe an AFPR would solve this? Or DSMlink of course.

 

[espinelli]

650's for a 16g is rediculous.

Yeah, 550's are sufficient. But I would go with 660's or 650's and leave some room for growth. All he needs to do is just lean things out a bit.

 

[suicidal2af]

Try out a new cam combo. 272in and 264ex.

This is exactly what I was gonna say. Run a more aggressive intake cam, and a less agressive exhaust cam. You'll be able to flow a higher volume of air into the engine, and the less agressive exhaust cam is going to increase your velocity and help create lots more torque.

I'd also consider dropping down to a 2.5" turboback, the slight gain in backpressure is also going to boost your torque.

 

[Stapl3]

Jesus. I remember 6-7 years ago when 550's were perfect for a 20g.

The overkilling gets worse and worse every year.

 

[herostar]

Eventually, yeah, but that's not going to help me now. I just need to know if the Extrude Honing of the IM and cleaning up of the head will give me the power where I want it.

I"m gunna take a wild guess, but for the price of doing headwork and extrude hone the intake it'll be close to a grand. Considering that a 4g64 crank is about 300, rods about 350, and pistons around 400, you could deffinately build the stroker for under 1400 if you do the work yourself.

 

[High PSI]

I"m gunna take a wild guess, but for the price of doing headwork and extrude hone the intake it'll be close to a grand. Considering that a 4g64 crank is about 300, rods about 350, and pistons around 400, you could deffinately build the stroker for under 1400 if you do the work yourself.

Price isn't the issue - it's time. This thing is not only my auto-x car but also my daily driver. I'm using a relatives car right now while I fix the head (timing belt went)...that's why it's off. Not to mention a full engine swap is not a project I want to take on in the winter. I don't have a garage...pulling the head is pushing it as it is.

 

[High PSI]

Jesus. I remember 6-7 years ago when 550's were perfect for a 20g.

The overkilling gets worse and worse every year.

One reason why I was considering sticking with the smallest injectors possible is that larger injectors have a harder time metering small amounts of fuel. This car is my daily driver - I don't want the drivability/gas mileage to suffer.

On the other hand, I've also heard that running injectors up towards higher duty cycles wears them out more quickly. Is this true?

 

[DSMeclipse4G63]

One reason why I was considering sticking with the smallest injectors possible is that larger injectors have a harder time metering small amounts of fuel. This car is my daily driver - I don't want the drivability/gas mileage to suffer.

On the other hand, I've also heard that running injectors up towards higher duty cycles wears them out more quickly. Is this true?

yes..

the best combo for midrange and great torque...better then a huge turbo:uts flamesuit on:: Would be a 2.3-2.4l stroker 8.5 compression, 2g head stock, 2g im stock, 1mm oversized valves, 1g tb, 264/264 cams, 18 psi on a ported t28 killer, small-decent size FMIC(good enough to cool the flow of 550cfms, i.e dejon tool street FMIC), short route piping, 2.5in o2 eliminator turbo back WITH 2.5in catalytic converter...muffler optional, 550cc, 190l, safc or dsmlink. I would say that combo would put everybit of 320-350hp to the wheels, as well as but loads of torque...Im guessing over 400.

Not only would you make the best low end a dsm could ever make, but also throttle response that could never be matched. Youd reach full spool at around 2k or less, and you would easily hold 18+psi to redline, with decent top end and great low and mid range. Ok I am now ready to recieve the flaming for a good idea...
Andrew

 

[NewB2dsm]

Sell it get a v8 for torque and power in mid range.