Marshall

Hey Guys,
Basically my goal is 450-480 rwhp at 20-22 psi on straight 104 -all of the time, not just for 4 or 5 drag strip runs. I could do 114 octane but I'm a little worried about the effects of the lead deposits over time. I guess I'm wondering if the 13B-REW is strong enough to support that on a weekend driving basis so long as there is race gas in the tank and a good tune? Basic setup will be an R85 kit or a T-66 Q-trim with a .81 and all the other stuff including water/meth injection. The ports will be stock or nearly so.

In summary, how strong is the 13b so long as it isn't detonated (or overheated)? Will it need doweling, ect? I'd like to get at least 15000 450+rwhp miles out of an engine before it needs freshening. Any of you perma-race gassers care to chime in?

thanks!

nyt

iTrader: (1)

you can do that on pump gas

Carl Byck

Well, I ran a TO4S at 28psi for ~2500 miles with no water injection, and had no problems on 100. I have a T66 .81 Q trim now, but it's not tuned. Planned boost is 20-25 psi all the time. I think it will be fine AFRs 10.5:1. Carl

Wargasm

You ran a T04S (60-1) at 28 PSI! Good god! That's off the flow map!

Carl Byck

Good thing I can't read one

Carl Byck

BUT, since I'd like to learn, how does the 3.0 correspond to 28psi? To top it off it is a .81 P trim into a 3.5" DP Spools like a V8, pedal down, tires smoke, car goes I will say I did not feel a difference between say 22, and 28psi. The car easily pulled an '03 996TT porsche, and an'04 ZO6 from ~30 to 120. Carl

Evil Aviator

Ignoring pressure loss at the air filter, and through the system...

PR = (Boost Pressure + Barometric Pressure) / Barometric Pressure

Example for 15psi barometric pressure and 28psi boost pressure:

PR = (28 + 15) / 15
PR = (43) / 15
PR = 2.87

Are you sure the turbo wasn't a TS04 rather than a T04S?

Carl Byck

I have it here, short of tearing it down would I be able to tell? Basicly, this was the turbo on the car when I bought it. it is a .81 un-divided, and a .60 compressor. I was told it was either a P trim, or an O. It is Garrett, the only unusual thing about it would be that it is water cooled, and that it has a 3.5" v band. There are various numbers cast into the housings, but nothing telling.

Thanks for the info on the map, now for the other axis, and how a particular map is suited to a particular motor.

Evil Aviator

http://www.gnttype.org/techarea/turbo/turboflow.html

Carl Byck

O'k, maybe in the morning, BTW sholdn't you be sleeping...

Evil Aviator

Moderators never sleep.

Marshall

So its doable? I don't believe pump gas (especially 91 in CA) for sustained back to back runs (ie a road course) for a second.

Carl Byck

As in my post, on 100 octane with NGK6725-11.5 and very rich, at 15 psi the afrs were richer than 10.0:1 from 3000rpm to 6000rpm. I did not have a WB when I was running 28psi I never tried to post a screen shot of a Haltech map, but if you tell me how, I will post whatever you want to see. Carl
I am trying to resize my dyno sheet so you can see the turbo at 15 psi.

Infini IV

You sure can, but why risk it. At that level of boost/power levels at only 91 oct, you would be walking a VERY tight line... even with a tune that might be able to support it.

Carl Byck

I'd say POP goes the motor. Just for the record, I originally hit that boost due to my own incompetence, by plugging the bleed hole on the AVCR solenoid. After that, I found the car fast, and with reasonable EGTs(don't ask, I do not remember, other than they were O'k) I think there was not much if any gain above ~20psi, but since I was already there, I decided to try it for awhile, and had no ill effects. I was ready to take one in the name of science, but the motor and turbo seemed perfectly happy, oh well

Wargasm

Carl has sent me this dyno and I made it fit on here for him....

100 octane
Modest Street Port
0.81 undivided P trim, T04S, 0.60 compressor
HKS cast undivided, RB cat back 13BT 89 irons FD housings, and rotors
15 PSI

zkeller

iTrader: (47)

Since February, Turbo Blue I believe is 114 Octane, 20 to 24 pounds of boost. Eight grand shifts very frequently. No ill effects thus far.

By the way the lead is a good lubricant.