just out of curiosity how quick does that thing pull lets say from 60 (freeway speed) to 160.

I already know that car is dangerously quick but at what speed you stop having traction problems


I would love a incar vid.



EDIT: imma check out the vid when i get home. Work blocks youtube

 

1.32 housing with ITS's R-trim wheel. I think the turbine exducer is 79mm .
I can't find the specs anymore sense they are out of buisness.
4" exhaust all the way.

I also have a 1.15 housing which I was using when running 15psi.

 

would you mind trading that 1.15 housing for my 1.28

 

The housing is only going to work for ITS's proprietary r-trim turbine.

 

K!


so any time where the speed starts to slow down?

 

congrats.....the car sounds incredible!

 

Get a good Electronic boost controller, and you'll not only have better boost control, the boost loads up much faster as well (spring doesn't creep open the WG partially until full wastegate). Don't know why ppl always under estimate the difference that this makes!!!

HKS EVC's have been great in the past for me, for external wastegates, it automatically adjusts the pressurization on both sides of the WG diaphragm. Real neat stuff. Go online and download the user manual pdf, check it OUT!

 

Iron you are my hero, one of these days......

 

Have you measured pre-turbine backpressure at those power levels? Waste-gate spring might be opening too much up top. Which boost controller are you running? I don't think its a turbo problem based on your dyno sheets. If you do swap turbos in the future, its time for a T6...

 

I am using a Apex-i AVC-R for boost control. Never measured backpressure on it.
Next time I have the manifold out I'll weld on a bung for it.

 

This is what I dug up from their archived site...
That is the correct comp map too.

 

Iron, have you looked into injecting water pre-turbo? It effectively broadens your compressor map. This would be a great opportunity to quantify the merit of using it in this way since you are already there (running out of turbo, that is). A pumpless, boost-driven system could be setup very easily and inexpensively. It would also be extraordinarily easy to install and remove without interfering with the rest of your set up. Just a thought.

Also, 1Revvin7 says that it might be time for a T6. Are you only running a T4?

Again, awesome car. Please keep us apprised of your future developments, whatever they may be.

 

Something I was thinking about while on the road today to my partents.
The MPH don't match up between the dyno and the datalog.
I wonder if I was loosing traction and spinning slightly.
Dyno A touch under 130mph , log shows 138mph.
Just a thought.
It is time for new tires anyway.

 

ah, yes. that sounds very possible to me! the way the curve flatens off very quickly but keeps a steady rise (looks like some 'wheelspinning' curves i have seen before) and then the little spike right at the end (pressumably when you are backing off) could easily be as some traction is regained when backing off...

sounds VERY feasable to me... maybe 850 is in order...?

 

You should be able to hit 900rwhp. I made 822rwhp @ 30psi on a 13B.

 

Remeber I am just using E85, not C-16. I was happy to hit 800 to start with.
I'm going to bump the rev limiter up, put on the drag radials, and try a couple things for the boost issue. We will see where it is at then. I wish I knew how lean I could go with E85 and still have some buffer there.

 

E85 has better cooling properties than C116 so in theory its a better fuel. Only downside is its not consistant which is why I don't use it. Every batch of fuel is different. The refining process isn't nearly that of a fuel like c116 or q116. But then again, at $1.50 gallon who cares, right, lol

 

i can see why you are trying to raise the boost given the compressor map.

your turbo at approx 24 psi/2.6 pressure ratio runs into stall at 100 pounds per minute as evidenced by the vertical RPM line and 55% efficiency. so the best is leftward.

the efficiency picks up a bunch so it makes 58 pounds net air all along the 2.6 pressure ratio line.

95 pounds X 60% = 57 net air
89 pounds X 65% = 58
83 pounds X 70% = 58
78 pounds X 75% = 58

if you could raise the boost to the 3.5 pressure ratio area you could do 95 pounds at 72% efficiency and be nowhere near stall...

95 X 72% = 68.4 net air.

given that you probably were not hitting stall and were making 95 pounds gross air, albeit at 60% efficiency, i think you did very well hp-wise.

generally 95 pounds of air makes 716 rotary rear wheel hp...

95 X 14.471 = 1374 CFM/1.92 = 716 rotary rwhp

another method tha generally works is 95 X 10 = 950/1.3 = 730.

my guess is that alcohol (properly administered) provides the additional hp.

you'll need more boost or more turbo. if you find a way to get more boost there's approx 17% more hp in the turbo.

howard

 

Would running dual wastegates help at all with the boost problem? Or does that only help when your boost is creeping not falling?

 

Dual wastegates help when your running low boost.

 

congrats....great stuff

 

Wow; congrats on the numbers!!! The 20B sounds amazing!

 

An A/F of 11.2 should be perfect on E85 for safety* (lean enough for good power, but rich enough to flood out any chance of detonation). I've seen rotory guys over 30PSI regularly at the track on E85. Even on the winter blend of E70 people run heavy boost with no detonating. What Ernie was mentioning about E85 not having as standardize of a mixture from batch to batch as premium blend gasolines its true, however it really doesn't matter with E85 as there is honestly so much of a safety margin as far as EGT's, super cooled cylinders, detonation supression of ethanol, that even if the blend was 2% (or even as much as 5%) off making for E80-to-E83 you'd still be well below the detonation thresehold for the type of alcohol based fuel you're running. Timing and a/f's are always dailed back from optinium power/max level for knock at the close of the tuning session. (I.E. you CAN run a little more boost safely...again, on E85 i'd be at 11.2a/f)

At least turn her up to 1.7bar from the 1.55 your running now, that turbo should have a lot more efficiency left in it....and with DR and more rev you should be very close to 900rwhp.

 

THAT THING IS BAD!!!! CONGRATS!! sounds amazing!!!

 

Right now I am running 11.5:1 to 11.7:1 afr.
There are a few local turbo / superchaged v8 guys running about 12.5:1. I know I can't go that lean. I'm stopping where I am at. I am going to try a run with .5* or 1* less timing just to see how much it makes a difference.

This evening I when I got home I bumped the rev back up and took it for a spin. It does seem to make power to 8500 but the boost falls to about 19-20psi above 8000.
Next time On the dyno I'll do a run set just at 20psi. IT would be crazy to see if it wil make 850rwhp at 20psi or maybe at 23psi.
I should have my new Nitto 555R's Tues. My Bridgestone S03's have had it.
Replumbed the wasegate and solinoid lines. I went with a alternate method used by alot of E-boost controller users. Made no difference.