What's the most Boost I can run on my GT30R w/my setup??

[Darth Maul]

I got the following installed:

-VAC .140 MLS Head Gasket
-ARP Head Studs
-GT3076R Internal Wastegate
-Porsche 993 TT HFM (next week)
-GReddy Profec II Boost Controller
-Innovative LC-1 Wideband
-Gonna get a Dyno Tuned Chip from my friend Titus (Dredder), most likely next weekend or so if he has time.

Just wondering how much boost I can run safely on this set up, with good tuning.

[highboostingm3]

Well doesn't look like your fuel pump or lines have been upgraded so even though you have the compression ratio, you might want to do 11-12psi max on 93 I would think. With that better pump you could probably do 18psi with the proper tuning and larger injectors...what size are your injectors?

[SiGmA]

I thought he was running 42#'s but maybe he isn't being its not listed. Speculation on my behalf, but I think with 42# injectors 18psi should be safe on 91-92oct pump.

How important are lines and pumps, and at what point does that come in to play? The Eurosport TS has an upgraded fuel pump, but stock lines. Where is the point that it becomes required to have larger lines or pump?

Thanks guys!

[Darth Maul]

yes I have 42#'s. Guess I would need to get an upgraded fuel pump. Not sure about what lines you're talking about?

[Furious]

i think hes refering to your fuel lines, you can upgrade your pump and continue to do so but if the lines restrict the flow than it will obviously hinder your performance.

[Black96m3]

what kind of upgraded lines are available????

[Furious]

that ill let the experts on FI answer as im not close to even needing those with my little rotrex charger setup hehe

[GGray]

You can run AN lines from the tank to the fuel rail. But you will need a new regulator and fuel rail. I ran -6AN from the tank to the regulator and through the BL fuel rail. And through a new fuel filter.

The -6 lines actually fit in the stock line holders under the car. So it looks almost stock

[alpinawhitem3]

Many people are making 450 + rwhp with stock rail and lines, upgraded pump.

[techno550]

I got the following installed:

-VAC .140 MLS Head Gasket
-ARP Head Studs
-GT3076R Internal Wastegate
-Porsche 993 TT HFM (next week)
-GReddy Profec II Boost Controller
-Innovative LC-1 Wideband
-Gonna get a Dyno Tuned Chip from my friend Titus (Dredder), most likely next weekend or so if he has time.

Just wondering how much boost I can run safely on this set up, with good tuning.

18-20 psi.

Well doesn't look like your fuel pump or lines have been upgraded so even though you have the compression ratio, you might want to do 11-12psi max on 93 I would think. With that better pump you could probably do 18psi with the proper tuning and larger injectors...what size are your injectors?

18 psi should be easy. 12 isn't impossible on stock compression and pump gas. (just not terribly beneficial compared to 9psi.)

yes I have 42#'s. Guess I would need to get an upgraded fuel pump. Not sure about what lines you're talking about?

Most use a walbro in tank 255lph pump. They were discussing replacing the fuel lines that go from the pump to the fuel rail.

You can run AN lines from the tank to the fuel rail. But you will need a new regulator and fuel rail. I ran -6AN from the tank to the regulator and through the BL fuel rail. And through a new fuel filter.

The -6 lines actually fit in the stock line holders under the car. So it looks almost stock

Stock fuel lines are *close* to -6 anyway. (which is why they fit so easily.)
(8/25.4*16)= -5 (dash 5)

The flow difference between -5 and -6, a 16th of an inch difference in diameter, isn't going to shift the max flow point by tons.

[Turbo ///M50]

how much that turbo run you

I got the following installed:

-VAC .140 MLS Head Gasket
-ARP Head Studs
-GT3076R Internal Wastegate
-Porsche 993 TT HFM (next week)
-GReddy Profec II Boost Controller
-Innovative LC-1 Wideband
-Gonna get a Dyno Tuned Chip from my friend Titus (Dredder), most likely next weekend or so if he has time.

Just wondering how much boost I can run safely on this set up, with good tuning.

[good & tight]

Question about the GT30R at what psi does it become inefficient is it good for 30psi?

[techno550]

Question about the GT30R at what psi does it become inefficient is it good for 30psi?

that depends. at a PR of ~2.4 the map *ends* around 50 lb/min. At 2.6, the map goes to ~53 lb/min. At a PR of 3, we're back to 50 lb/min. The map goes all the way up to a PR of 3.4, but you're down to 40 lb/min by that point.

so the *sweet spot* is the just-past-50 mark at ~23psi. It'll do 30 psi and flow just past 50 lb/min efficiently there.

[Darth Maul]

how much are those walbro 255 pumps?

[luv4myE36]

i think around $100-$120 if im not mistaken

[dredder]

your stock fuel pump should be good for 400rwhp if im not mistaken

[highboostingm3]

Question about the GT30R at what psi does it become inefficient is it good for 30psi?

I know somebody(non-bmw)ran it to 40psi and 540whp(Mustang) on 2.0L.

18 psi should be easy.
Most use a walbro in tank 255lph pump.

That is correct. He gets the pump and he is good to go.

[Darth Maul]

So what's the most I can boost without the pump, even though I have the 42#'s. I'm picking my car up hopefully today, so just wondering about this.

[highboostingm3]

So what's the most I can boost without the pump, even though I have the 42#'s. I'm picking my car up hopefully today, so just wondering about this.

You can try for 18 but keep that wideband dialed in to see if your car starves for fuel anywhere in the rpm range. However, 18 should yield much more than 400whp and that is the amount people say where you should go Walbro if you want more power. So start at 13psi and keep working up until you see some lean issues and then back off.

[SiGmA]

how much are those walbro 255 pumps?

I think mine was $100+SH (~$10) for a Walbro 255 w/ install kit (Generic kit) from Oakos.com. There are many places to find one for about the same price, but this one happened to have an install kit. And shipping was quick!

Titus, have you finished up his tuning?

How is she drivin'?!

[Darth Maul]

Hopefully next weekend when I get my Porsche 993 TT HFM, Drove my car tonight, wow, it feels way better. I can't wait for the Dyno Tune, gonna try for 16 psi or so. Right now it feels fast and very smooth!!! Gotta get my Wideband O2 Sensor plugged in, Saturday i'll see what the AFR's are.

[Darth Maul]

Sigma, you should make it to our HUGE Oregon Meet on the 30th!!

[dredder]

Hopefully next weekend when I get my Porsche 993 TT HFM, Drove my car tonight, wow, it feels way better. I can't wait for the Dyno Tune, gonna try for 16 psi or so. Right now it feels fast and very smooth!!! Gotta get my Wideband O2 Sensor plugged in, Saturday i'll see what the AFR's are.

Thats great Tony. Didnt I tell you i would take care of it. Wait until I get my car running so we can dyno at the same time.



Stay tune BFC member for VID and complete writeup, hopefully this saturday.

[Black96m3]

Looks interesting

[dredder]

Looks interesting

Rmember, this is the TSI kit (the upgrader version-Extreme), with GT3076R internally gated running on DME tuning.