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gmendoza

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Posts posted by gmendoza

  1. Exhaust sound

    in Induction/Turbo/Manifold/Exhaust

    Posted

    does anyone have any sound clips with straight pipes and cats still in. I don't know if I want to go catless and deal with all the O2 sensor business, but would like to have a little more sound than my tubi exhaust offers. I do really like the sound of your car, though gmendoza. Do you have BOV's or is that full turbo sound just from removing the cats?

    Yes, I have HKS SSQV BOV's. With cats & straight exhaust, it'd have the same tone just quieter.

  4. code p0108

    in ECU/OBDII

    Posted

    just purchased them.. tested them and they start to open at 9psi and fully open at 12psi... that sound right to you? I've had them installed for 1-2 thousand miles...

    could they be faulty or installed wrong?

    We've gone over this before. Your combo will give you more than 12psi, more than 15psi up to 19-20psi thru your midrange. Eventually boost will tapper off to 12-13psi in the upper RPMs only because the turbos are too small to keep up.

    In the higher gears, 4th & 5th, you spend alot more time at a given RPM. It is very possible that because of the RPM you were in, boost lingered ~ 18-19psi long enough to trigger a CEL. Usually in the lower gears & higher RPM's, boost will tapper off before the CEL is triggered.

  8. wastegate capsules

    in Induction/Turbo/Manifold/Exhaust

    Posted

    ... for a moment there may be above 12psi boost if you lay on the throttle hard and fast but that is normal with any car as the ecu/wastegates struggle to catch up to sudden power..

    Textbook definition of "boost spike" :yes

    Also, notice how Marcus said that's exactly what a healty V8 should make under ideal conditions and 0.9-1 bar of boost (14-15psi).

    Like I said before, I think you sould verify your boost. Johan's telling you what it should be in theory but there's no way to tell without hooking up a boost gauge.

  9. wastegate capsules

    in Induction/Turbo/Manifold/Exhaust

    Posted · Edited by gmendoza

    looking at the dyno runs do you see boost spikes?

    You won't see "spikes", just one. And yes, your graph shows that. Look at the shape of your tq curve. Notice how your tq spikes up as your turbos spool up then your tq tapers off. Boost is doing the same thing ending at ~ 13psi at 7k rpms.

    If your boost was a consistant 12psi, then your peak tq would be lower but the curve would be alot flatter.

  10. wastegate capsules

    in Induction/Turbo/Manifold/Exhaust

    Posted

    Great numbers Pano!!! Although those numbers confim that you are making more than 12psi of boost. A V8 with high flow air filters, exhaust and ECU at a true 12psi will make about 370rwhp/330rwtq.

    Those numbers look like that of a boost curve that spikes to 17-18psi for a split second (any fast spooling turbo will spike; it's not voilent) settle at around 15psi and taper off to 13-14psi by redline.

  12. wastegate capsules

    in Induction/Turbo/Manifold/Exhaust

    Posted · Edited by gmendoza

    Another way to look at it would be that by increasing your base boost, you also shift your boost curve. For example a V8's boost with stock wastegates will range from 5psi to 11psi with say 14psi spikes depending on conditions. Now on that same car if you install harder wastegates that increase the base boost to 9psi, then your boost will range from 9psi-14psi with 17psi spikes,

  14. wastegate capsules

    in Induction/Turbo/Manifold/Exhaust

    Posted · Edited by gmendoza

    even with johan's chip? are you sure about this?

    my understanding is that regardless of what the ecu is doing.. the wastegates immediately open directly responding to the pressure on them.. is this wrong?

    Yes, the wastegates do open immediately directly responding to the pressure on them if there was no controller (boost solenoid) in line with the wastegates. But on the V8, they hardly ever see the actual boost pressure due to the stock boost controller being in-line with the wastegates reducing pressure to the wastegates. Pressure travels from the manifold to the stock boost controller to the wastegates. So the wastegates see less pressure than actual pressure resulting in more boost.

  15. wastegate capsules

    in Induction/Turbo/Manifold/Exhaust

    Posted · Edited by gmendoza

    gmendoza.. however if you can test the capsules so that they are sure to be fully open at 12psi, you should be ok w/ a chip like the JOHAN ecu..

    I tested the new ones before installing.. and it appears to start to open around 9psi then fully open at 12psi.. before I hooked them up to the car..

    do you believe this is sufficient or should I do more testing?

    If your wategates start to open at 9psi (via hand pump) and you are using the stock boost controller, then I'm almost positive you are getting more than 12psi. Remember, the ECU is restricting the amout of boost the wastegates see by whatever percent to "fool" the wastegates into making 11-12psi expecting wastegates that open at 5psi. So it will take more than 9psi for your wastegates to see 9psi.

    Now if you want to be positive of how much boost you are making, install a boost gauge.

  17. Starter and E-brake

    in Engine/Ancilliaries

    Posted

    That was just a coincidence. Your starter seems to be going out. When they are on thier way out, they wont work and a few minutes later without any rhyme or reason, they'll work again. Don't trust it as it will most likely happen again. Same thing happened to me in my Z28 yesterday; replaced the starter today.

  18. Future 350 v8 owner

    in Esprit Chat

    Posted

    Id really like to own a 350 v8 esprit i know they cost quite a bit to buy but thats not such a massive proplem! Im just wondering about the availablity of parts are they hard to get hold of?? And how relaiable are they as a daily driver? Im also wondering if there are any car shows coming up where i can see one?

    Cheers Dan!

    Where do you live?

  19. wastegate capsules

    in Induction/Turbo/Manifold/Exhaust

    Posted · Edited by gmendoza

    I know that I, as well as others on this forum, have suggested AGAINST upgrading the wastegates with the stock ECU & stock boost controller. The reason being, 12psi wastegates will result in more than 12psi of boost.

    Recently I decided to get some real data to share what happens when you do this. I bypassed my Blitz boost controller, connected the stock boost controller and off I went to do some logging. My minimum mechanical boost is 8lbs (when they start tp open).

    I logged consistently peak boost of 18psi leveling out to 15psi!!!!!!!!!!! This was done with water/meth injection which also helps with boost spikes. Without it spikes would have been worst. Yes the car felt awesome but I would not want to consistently be running that much boost on a car without any kind of intercooling.

    I wasn't surprised by the results, I've even warned some people about this in the past but I've never seen any real numbers posted. So I decided to get some real numbers. Also the numbers would have been much worst with a higher base setting.

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