[ohheyitsjon]

April 1st is my appointment w/ Doug from Topspeed . That gives me roughly a month to add some goodies to my car. my setup is this:

1) Cobb AP
2) Apexi Catback
3) Tsudo DP
4) APS CAI
5) 1 step colder plugs

not installed: Apexi AVC-R (i will use this only to maintain boost throughout rpm)

What other mods do you guys suggest me buying that would enable me to take full advantage of my car/give me higher hp and tq numbers?

Some items i have thought of purchasing were:
1) alky injection
or
2) Gruppe-s headers
or
3) Quicktime Electric cutout DP

i'm located in cali, so all we have here is the crappy 91oct.

thanks in advance!

[Gruppe-S]

Hello,

I would recommend the headers or the QTP cutout. There is no downside to the headers; only upside. The QTP cutout will need to be tuned for to optimize the power gains. You'll see more gains from the headers. I would recommend against the alky injection because the VF39 is such a small turbo. Running alky w/ 91 will be like running 98 or 99 octane all the time and you'll certainly gain some power with this mod but mostly you'll just gain a buttload of torque. With headers, we usually see from 265-275 WHP and 285-300 WTQ on our Mustang 4WD dyno (stock is about 220 / 220). Alky injection is much better suited to larger turbos that can move more air. The VF39 is already close to being maxed out without adding the alky.

Thanks,

Geoff

[Delaware Subaru]

Agile Auto got like 350hp & 365tq out of an STi with a SMC kit. I believe the mods were protuned AP, SMC kit, catted TBE, CAI, & prodrive boost solenoid. This was with a VF39 and dynapack. I disagree with alky not being a solid mod on a VF39. It may produce bigger #'s on a bigger turbo but the stock manifold p&ped from crucial racing is WAY better than any header and is cheaper. Go with meth/h2o.

*edit*- I thought torque was good?

[ohheyitsjon]

thanks for the input guys!!!!

[555BLACKOUT]

I thought tourqe was good. I was thinking about the alky for the summers here in AZ to go along with our crappy 91. You guys think it would be worth it using it to help get you a safer tune not so much for all out power?

[Delaware Subaru]

My current performance mods on my 05 STi 1)Cobb catless TBE
2)K&N panel w/ "modified" stock intake
3)accessport protuned
This settup made 285hp 325tq on a dynapack back on 8/05. I am getting retuned in 2 weeks and adding a boost solenoid and the SMC kit. I will update when the results are in.

[BLACK02WAGON]

I would do the alky kit and then send your stock headers to crucial racing and have them P&P'd and ceramic coated.

Good Luck

[Delaware Subaru]

That is exactly what I have planned.

[JDM-STI]

Originally Posted by BLACK02WAGON

I would do the alky kit and then send your stock headers to crucial racing and have them P&P'd and ceramic coated.

Good Luck

How much does crucial charge for the p&p?

[Gruppe-S]

Originally Posted by Delaware Subaru

Agile Auto got like 350hp & 365tq out of an STi with a SMC kit. I believe the mods were protuned AP, SMC kit, catted TBE, CAI, & prodrive boost solenoid. This was with a VF39 and dynapack. I disagree with alky not being a solid mod on a VF39. It may produce bigger #'s on a bigger turbo but the stock manifold p&ped from crucial racing is WAY better than any header and is cheaper. Go with meth/h2o.

*edit*- I thought torque was good?

There's definitely some validity to your point. OK, let me clarify. Alky injection (when used safely and tuned safely) is good no matter what. Raising the effective octane of your gas is good no matter what. You will make power no matter what. BUT, it would yield much better results on a bigger turbo. Torque is good, especially for a daily driver. However, if the VF39 is already operating at peak efficiency and you push it even harder, it's not going to make more power; only more torque. My thoughts are that if you're going to spend about $1000 on modifications, I'd buy a bigger turbo before I'd add alky / meth. However, if you're going to keep your stock turbo, then alkly / meth is a good addition. Headers are also a good addition and are cheaper and more hassle free than alky / meth. Also, if you run 100 octane, headers will still give you a gain. If you run alky / meth w/ 100 octane, the benefits will be somewhat negated.

Do you have any evidence at all to substantiate the claim that Pn'Ped headers from Crucial will make more power and torque than aftermarket headers? Or do you just believe this because it's the word on forums? We hope to test Pn'Ped headers with a crossover pipe back to back against our headers (both with a tune) very soon. Everyone claims the PnPed headers make better power just because the Rigolis run this setup but I haven't seen any hard dyno evidence. It's very possible that this is true but I'd like to see some cold hard facts to back it up.

Originally Posted by 555BLACKOUT

I thought tourqe was good. I was thinking about the alky for the summers here in AZ to go along with our crappy 91. You guys think it would be worth it using it to help get you a safer tune not so much for all out power?

Again, torque is good but torque with power is better. Alky is definitely a good combatant for hot weather since it lowers the temperature of your intake charge. It's also a good safety measure for crappy gas since it raises your effective octane level. But raising the effective octane level of your gas is really useful because it allows you to run higher boost and more timing advance.

Thanks,

Geoff

[drofnums]

Adding alky to stock VF39 only nets you about 10-20 whp, but a lot more torque. See the thread I started on NASIOC with dyno plots of turboback modded STIs running two maps on a VF39 (with and without alky).

http://forums.nasioc.com/forums/showthread.php?t=891446

I'm doing alky on my VF39 because I like the torque, and I like keeping the intake cool during summer months here so my car doesn't pull so much timing. Also because I plan on keeping the TMIC even when I upgrade to a bigger turbo like the 20G. So alky subs for a FMIC cooling the charge.

Finally, alky is only $500, while a bigger turbo + injectors +... is at least $1,000 more than that.

[Delaware Subaru]

"Do you have any evidence at all to substantiate the claim that Pn'Ped headers from Crucial will make more power and torque than aftermarket headers?"

I have evidence it is alot cheaper and the burdon of proof of your header providing more power lies with you.

[Gruppe-S]

Originally Posted by drofnums

Adding alky to stock VF39 only nets you about 10-20 whp, but a lot more torque. See the thread I started on NASIOC with dyno plots of turboback modded STIs running two maps on a VF39 (with and without alky).

http://forums.nasioc.com/forums/showthread.php?t=891446

I'm doing alky on my VF39 because I like the torque, and I like keeping the intake cool during summer months here so my car doesn't pull so much timing. Also because I plan on keeping the TMIC even when I upgrade to a bigger turbo like the 20G. So alky subs for a FMIC cooling the charge.

Finally, alky is only $500, while a bigger turbo + injectors +... is at least $1,000 more than that.

Thanks for the support there. I guess I still could have been more clear with my explanation about torque being good.

Torque is a force while HP is torque applied over an amount of time. That's why trucks can make fantastic torque at low RPMs and still have low HP. Torque is good to the point where you can use it quickly but if you can't use it in a given amount of time, then all the torque in the world will do you no good.

Originally Posted by Delaware Subaru

"Do you have any evidence at all to substantiate the claim that Pn'Ped headers from Crucial will make more power and torque than aftermarket headers?"

I have evidence it is alot cheaper and the burdon of proof of your header providing more power lies with you.

That wasn't my question. Just because it's cheaper, doesn't mean that it make more power. The burden of proof does lie on us and that's why we have dyno charts for our headers. My question was, "Do you have any evidence that the Crucial PnP make more power than aftermarket headers?"

Thanks,

Geoff

[Delaware Subaru]

I think Gruppe-S has some of the best prices and best customer support I have seen. I love your prices and your products. I just think $200 for a p&p Crucial manifold is a steal compared to aftermarket headers. I believe the hp difference between the two would be minimal. I would love for someone to do a comparison between the two *hint*.

[La Mer]

Originally Posted by Delaware Subaru

I think Gruppe-S has some of the best prices and best customer support I have seen. I love your prices and your products. I just think $200 for a p&p Crucial manifold is a steal compared to aftermarket headers. I believe the hp difference between the two would be minimal. I would love for someone to do a comparison between the two *hint*.

They just don't like to PM back....