john, i don't have a picture of inside the inlets, but it looks similar to the cxracing core in the post theorie made comparing a chinese cooler to a nicer greddy IC.

the foils in the hot air path do exist, but they're not super tight like some of the more expensive IC's. these foils appear to be about the same as the rx7store IC i just removed.


mine:





edit: the inside looks very similar to this:




definitely no spearco, but not like some of the china parts horror stories i've heard (and experienced).

 

Thanks, I was just curious to see if there is a differences as I know most of the off brand coolers are significantly lighter than the quality known brands.

You get a set of 4 tires for free?

 

yeah my coworker has a 370z race car and they always use R888s for practice and dialing in different setups because of their consistency and stiff sidewall.
he bought a set new and shaved, did one session on them, then pulled them off. he gave them to me for free because there at ~50-60% tread.

there are actually a lot of track guys here. it's strange.

 

I am jelly bro.

 

jelly? i'll trade you straight up.

 

twerked on this POS again tonight:

 

did some more work this weekend
















https://www.facebook.com/video.php?v...83992162348849

 

current state of engine bay after tinkering more this weekend:
intake air temps have dropped substantially.

 

so when are you going to add water?

I've figured it's about time since you're all about reliability

 

add auxiliary water injection? i won't be.

while i'm all about reliability, i am also about simplicity.

i'd switch to e85 and special premix before adding aux injection.

 

Why is your MAP sensor upside down?

 

you know what, brosio? i have never noticed that. i actually assumed it was supposed to be mounted this way!

i'll swap it now that i know.

 

Good call. Water/meth can sometimes be illegal with certain organizations and also can be a factor when classing the car if you decide to start getting into competitive run groups.


Nice build man, really liking the EFR results. This thread is part of the reason I chose to switch to an EFR. Looking forward to more progress and videos.

 

A little birdie told me you were going e85....

 

i did indeed switch to e85 this weekend.
the exhaust smells like an alcohol dragster or a nitro RC car.

more info:
after changing my intake/intercooler setup i'm once again having issues with boost creep (see earlier pages in this thread just before my dyno day).
when this first happened i simply changed out the wastegate actuator and the problem was fixed, as if the downpipe exhaust flow was pushing the wastegate flapper shut (possibly? i'm not sure). the issue is that i can set the boost wherever i desire (via my haltech boost control) and the boost will creep to about 15psi by redline, even with the boost control disabled --boosting with the wastegate actuator-only hits about 7psi and creeps to 15psi by redline. i even put my smaller (tiny) K&N air filter on the turbo to restrict the intake, then added two socks over the top of the filter to restrict it more, and it crept exactly the same, up to 15psi by redline.

so i'm not sure if this happening again at the same time as my intake/intercooler upgrade is simply coincidence, but it is annoying. i am going to wire the flapper open and see if it still creeps, and if it doesn't i'll try a turbosmart EFR wastegate actuator (they are a billet aluminum unit with interchangeable springs like a wastegate or tial BOV)

i figured this would be a good time to switch over to E85 in case my new setup is indeed overflowing my internal wastegate. i can just set the boost to 15psi and it will be plenty safe for track use, but this doesn't alleviate the annoyance of there being no e85 pumps within 30 miles of the 3 biggest race tracks within 5 hours of nashville, which means i'll have to transport 20+ gallons of e85 fuel with me to track events --not ideal.

for track use i have a personal whp limit of ~350whp. of course the car will make ~50whp more on 15psi and e85 and create much more stress on my driveline parts and be generally just too much power at the track (350whp is more than enough to be fast on the track) but if i can't keep the boost as low as i want, i may as well make it safer running ethanol.







e85/boost issues aside, i did get a passenger seat from a local friend who has a bunch of leftover parts from his old white 94 from years ago. he is letting me use the seat on long-term loan until he puts it in his REPU

air conditioning, passenger seat... this thing is feeling like a normal street car!

 

AWSOME! I cant get enough of this car!

 

thanks gavbey! it's currently angering me



i did some troubleshooting on the boost creep issue tonight.

first i replaced my intercooler/intake setup with the old setup and went out and tested.
boost crept to 15psi.

so i replaced swapped the intercooler/intake back with my new setup and was about to call it a night... then i just got under the car and removed the wastegate actuator and wired the wastegate flapper door OPEN with the actuator off the car. this removed any doubt that the actuator was indeed the problem.
so i went out and tested again, turbo lagged due to the gate being wired open, then the boost crept up to 15psi.


so i'm completely confused now, and i have no idea why the boost was controllable at 11-12psi for 3 track events and --out of nowhere-- it won't go below 15 psi.

my spark plugs are nearly fouled out since switching to e85, so it's misfiring at high load / high RPM, but it was doing this on gasoline with no misfires last week.

 

Did it start doing this only after you switched to E85?

 

Nice! Good to see the switch over to corn!
Also congrats on your new countersinking capabilities haha. Though I'd suggest swapping out those philips machine screws for some countersunk socket head bolts. Just looks more like something that belongs on a car -- not on a kitchen cabinet hinge! Hahaha

aaaaaaand yes, obsessively nit picky.

New induction looks like it should work out great!

 

chris, maybe you didn't notice these are 4-40 (tiny) thread! i wasn't able to find any allen countersink screws. granted, i didn't search that hard

 

Yeah, I obsess over those little things too sometimes.

I found some green titanimum allen heads for my steering wheel to hub that match the RE Mommamia wheel and Takata green accents.

 

arca,
it seems to have started after my latest track day at Barber. it was definitely doing it on gasoline.

1. i drove the car hard at barber (and it was 95*F and 45* humidity outside) and drove it home, then didn't drive the car for two weeks while i was changing the intercooler/intake setup.

2. once i completed the intercooler/intake setup i went out for a drive to test IATs, AFR, etc. and the boost crept up to 15psi no matter what i did with the boost control (haltech control, spring-only, etc.)
so i thought maybe my previous intercooler/intake setup was restrictive enough to keep the wastegate from overrunning. unlikely, as the car made expected power ~340whp @ 11.5psi on a dyno dynamics.

3. i switched to e85 thinking i'll just have to deal with 15psi from now on because i freed up my restrictive intake and the wastegate is now being overrun and can't "waste" enough exhaust to keep the boost below 15psi. the e85 seemed to make no difference in the boost creep.

4. nearly obsessing over the boost creep issue last night i changed back to my previous intercooler/intake setup (rx7store VMIC and 4" shorty K&N air filter directly on the turbo) "just for *****-and-giggles," as they say, and the boost still crept up to 15psi. "WTF"

5. so i got under the car and completely removed the wastegate actuator and physically wired open the wastegate flapper, went for a test drive, and the turbo lagged (starting from 0 psi open wastegate flapper) and crept up to 15psi! "double WTF" it doesn't get any more cut-and-dry than wiring open your wastegate to see if it creeps...


so this setup has worked perfectly fine for 3 full track days (over 6 hours of all-out track boosting) at ~11psi, and out of nowhere the boost is uncontrollable even with the gate wired completely open.

i still have ignition misfire due to the plugs needing replaced, which i will do tonight, but i don't think that's going to fix it.

 

Some restriction in the after the ic maybe? Check the throttle body for full operation.

I'm just spit balling here...good luck, I hope to have my car similar to yours soon.

 

that would actually have the adverse effect.

the whole issue with "boost creep" is that the engine is pumping out too much exhaust at low boost for the wastegate to "waste" enough and to keep the boost down (turbine speed down).
so if the intake was restricted the engine would be flowing less air, which would actually help fix the problem!

good luck with your setup!

 

With your newer intake setup (and cooler days), your IAT's are lower, making your intake air more dense. So, at the same boost pressure, you have a higher mass air flow rate than before. Higher flow through the compressor means higher flow through the turbine. The compressor power shouldn't be much higher (same PR, slightly higher mdot), so the turbine will require roughly the same amount of flow as before to meet the compressor power demands. However, you have more exhaust flowing to the turbine than before, so more turbine flow has to be wastegated. An 8374 is on the limit of wastegate choke (supersonic) at 12 psi anyway; so I'd guess you were just below wastegate choke with high IAT's, and just over the choke limit with lower IAT's.

You mentioned restricting the compressor inlet. Since you're still controlling boost to 12 psi (or trying to), the flowrate through the compressor/turbine will still be the same. What you ARE doing there is increasing the compressor pressure ratio which requires more power from the turbine (think of the compressor like a dyno for the turbine). So for the same boost level you will bias more flow toward the turbine wheel (away from the wastegate) in order to keep up with the higher compressor power demands. So yeah, that might work, but your compressor seal will start to leak quite a bit of oil if you restrict it too much.

Another possibility would be to restrict your exhaust some. Not a perfect idea though because your EGT's will increase. You might play with the exhaust restriction option in MatchBot to see how much restriction would be required to decrease the wastegate flow below choke. I think that calculation will show the EGT difference too.

The BEST option would be external wastegates... but that's a lot of work.