How much whp do you guys think I will put down!

[david200095367]

How much whp do you guys think I will dyno this Saturday when I get tuned. I will be dyno tuning it at 16-18 psi.

s14 sr20detApexi power fc d-jetrosard 850cc injectorsbottom mount garrett gt3071r .86megan racing manifoldmegan racing elbowfront mount intercooler3in turbo backr32 rear diff

[supreamS14]

I don't think the stock cams will flow past 380whp, but Im not sure about that. I have searched everywhere for that answer. I think some one made as much as 380whp on stock cams. If the stock cams still make power around 7200rpm I would guess damn near 380-400whp.

[david200095367]

I don't think the stock cams will flow past 380whp, but Im not sure about that. I have searched everywhere for that answer. I think some one made as much as 380whp on stock cams. If the stock cams still make power around 7200rpm I would guess damn near 380-400whp.

Yea the tuner said somewhere around there as well. Would it be ok to set my rev limiter at 7500 rpms?

[supreamS14]

I would set it where WHP starts to dip down. When I dynoed my sr, I told them to rev up-to 6500rpm. I think that's where the stock turbo runs out of breath. I have a GT28R and the dyno print out looked like it wanted to make power to 7000rpm. I got on it one day and my power-band feels like it's still making power @ 7000rpm. I wouldn't rev past 7500 with out RAS.

[david200095367]

I would set it where WHP starts to dip down. When I dynoed my sr, I told them to rev up-to 6500rpm. I think that's where the stock turbo runs out of breath. I have a GT28R and the dyno print out looked like it wanted to make power to 7000rpm. I got on it one day and my power-band feels like it's still making power @ 7000rpm. I wouldn't rev past 7500 with out RAS.

well with this turbo im thinking it should still be making power all the way to 7500 right?

[supreamS14]

Mabby

[I ask good questions]

I wasnt aware you could bottom mount a gt30. Did you have to do any major modifications and is it internally or externally gated?

[idahotuner]

the flow for a bottem mount t2 flanged gt30 turbo is to low its restricted by the flange. i cant see any benefit over a gt28 styled turbo. plus the mix match with stock cams your power will be rough with the stock cams opening up way to early for the turbo.

i want to say you will be lucky to get 350

what are you using fora MAF?

[jr_ss]

the flow for a bottem mount t2 flanged gt30 turbo is to low its restricted by the flange. i cant see any benefit over a gt28 styled turbo. plus the mix match with stock cams your power will be rough with the stock cams opening up way to early for the turbo.

i want to say you will be lucky to get 350

what are you using fora MAF?

Correction Idaho, there is a way to make power on the BTM 3071R. But you can't use the internally gated T2 housing.. You need to go with this one http://www.atpturbo.com/Mercha...e=GTH. It supposeably flows slightly less than that of the straight T3. It also has the huge benefit of running an external gate. I'll be using this setup on my build within the next few months. I'll post when I get this bad boy...

[david200095367]

I wasnt aware you could bottom mount a gt30. Did you have to do any major modifications and is it internally or externally gated?

no modifications it was pretty much bolt on. Im running an internal wastegate.

[david200095367]

the flow for a bottem mount t2 flanged gt30 turbo is to low its restricted by the flange. i cant see any benefit over a gt28 styled turbo. plus the mix match with stock cams your power will be rough with the stock cams opening up way to early for the turbo.

i want to say you will be lucky to get 350

what are you using fora MAF?

i think you are wrong. How can a gt2871r push 400wp on bottom mount but yet mine wont? worse case it flows like a gt2871r and still makes power. I know i dont have cams but I still think i can make more than 350 whp. I guess we will see saturday. As for maf im running a djetro which means im running map.

[idahotuner]

good choice with the map.

well we will see saturday.

i suppose. reason i made power like i did was the combination of cams and stuning plus other parts.

well it will be interesting to see the resutls

[david200095367]

good choice with the map.

well we will see saturday.

i suppose. reason i made power like i did was the combination of cams and stuning plus other parts.

well it will be interesting to see the resutls

yea i have bolt on supporting mods too except the cams.

[jr_ss]

The problem with the internally gated 3071r, is the compressor flows so much more than the 2871r, but the ex side doesn't allow it to do that because it gets choked down. I imagine you'll see more than 350whp, but I don't think you'll see anywhere close to 400whp. Expect a lot of spike an/or boost control issues, that quarter sized hole can't regulate the turbo right on anything above the 2871r.

You'll have a fatter mid range with this turbo though, which is a good thing.

[david200095367]

The problem with the internally gated 3071r, is the compressor flows so much more than the 2871r, but the ex side doesn't allow it to do that because it gets choked down. I imagine you'll see more than 350whp, but I don't think you'll see anywhere close to 400whp. Expect a lot of spike an/or boost control issues, that quarter sized hole can't regulate the turbo right on anything above the 2871r.

You'll have a fatter mid range with this turbo though, which is a good thing.

if the internal wastegate starts giving me problem I wll upgrade to that exhaust housing.

[david200095367]

ok so i had some bad boost creep to 27 psi. so he was not able to get my numbers at 18 psi. i need to go back after i port my wastegate flapper or convert to external wastegate. Besides that i at 10 psi i dynoed 268whp and 255tq. So im going to fix some issues and maybe get cams and go back for a retune. Better luck next time i hope.
Modified by david200095367 at 9:34 AM 3/8/2009

[idahotuner]

kinda what i expected. throw some cams in there and go externally gated.

waht boost controller were you using.

with my avc-r i can tune out boost spikes

[jr_ss]

Yeah, I knew there were going to be boost spike issues. Even at 10psi those are some really good numbers. I would expect another 100-120whp when you get it situated.

[david200095367]

Yeah, I knew there were going to be boost spike issues. Even at 10psi those are some really good numbers. I would expect another 100-120whp when you get it situated.

Yea seems pretty good for 10 psi. What do you guys recommend i do? port my stock wastegate flapper buy a tial exhaust housing for this turbo or weld s port on my manifold for a tial and weld the flapper shut?

[jr_ss]

The cheaper route would be weld the flapper shut, and have a gate welded on to the manifold... You already know the route I'm going, which may not be the cheaper but I think best route.

[cameron14]

400

[david200095367]

The cheaper route would be weld the flapper shut, and have a gate welded on to the manifold... You already know the route I'm going, which may not be the cheaper but I think best route.

what route are you going?

[jr_ss]

The housing I supplied the link to up top...

[david200095367]

The housing I supplied the link to up top...

so it places the wastegate towards the block? is there actually room for the wastegate there?

[jr_ss]

No it places it towards the strut tower. If there isn't enough room for it to fit, I'll weld a pipe up then the dump back down...

[david200095367]

No it places it towards the strut tower. If there isn't enough room for it to fit, I'll weld a pipe up then the dump back down...

so how would this housing be better than welding a flange on the manifold itself for a 44mm tial?

[jr_ss]

Because the exhaust housing flows better than a T2 housing... Even with the wastegate welded shut you won't be able to flow as well as the ATPturbo housing.

[david200095367]

Because the exhaust housing flows better than a T2 housing... Even with the wastegate welded shut you won't be able to flow as well as the ATPturbo housing.

is it proven fact that it will flow better this way?

[jr_ss]

I called ATP and talked to them, they said it'll flow slightly less than a straight T3 housing, I'm going to take their word on it.

[david200095367]

I called ATP and talked to them, they said it'll flow slightly less than a straight T3 housing, I'm going to take their word on it.

when are you going to run it?