JUST PURCHASED A BUILT TURBO CAR, request your wisdom
Just purchased a 1990 shortnose crank (113K) Greddy turbo car (only 10K on turbo) Good deal had to buy it...
I also have a Spec Miata 1.6 and a street 1990 with a longnose crank motor Greddy Turbo car has.... GFB vent to atmosphere blow off valve Bipes ACU Koyo 37mm larger Alum. radiator 1.8 injectors installed (1.6 available in a box) running stock boost 4.5 PSI Vortech Fuel Pressure Regulator Base Timing is set at 12* and the Bipes is set to pull 6* @ RPM also pulls a little bit based on Temp. It did pass SMOG but on the limit on HC (108) and seems to be rich at low RPM probably due to the 1.8 injectors It also dies occasionally after the RPMs come down by putting in the clutch...if it does not die it goes down to 200 RPMs and bounces back up to 800 RPMs probably due to 1.8s? I have a FM cat to add and a RB exhaust.... ????????S Is the turbo too much for a short nose? any preventative measures? I would like to run more boost, is it safe with this setup? Setup ideas? Is there a way to set up air fuel meter on the car to help tune? Suggestions on relocating the intake from stock Greddy position (back of engine bay)?cost effective approach? Suggestions on an intercooler?size?brand?kit?piping? most cost effective? |
Originally Posted by Danimal
(Post 114672)
It also dies occasionally after the RPMs come down by putting in the clutch...if it does not die it goes down to 200 RPMs and bounces back up to 800 RPMs probably due to 1.8s?
bad dashpot? vacuum leak - (BOV recircuilated?)
Originally Posted by Danimal
(Post 114672)
Is the turbo too much for a short nose? any preventative measures?
Originally Posted by Danimal
(Post 114672)
I would like to run more boost, is it safe with this setup?
Originally Posted by Danimal
(Post 114672)
Setup ideas?
Originally Posted by Danimal
(Post 114672)
Is there a way to set up air fuel meter on the car to help tune?
Originally Posted by Danimal
(Post 114672)
Suggestions on relocating the intake from stock Greddy position (back of engine bay)?cost effective approach?
Originally Posted by Danimal
(Post 114672)
Suggestions on an intercooler?size?brand?kit?piping? most cost effective?
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Isnt stock boost 5.5?
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The short nose problem can be an issue even without FI. Might be a good idea to inspect it anyway. As is, you' d be save to ~6 psi. With I/C and everthing you have now, you can go to 8psi. Check vacumn as it drops to idle.
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If you don't have any vacuum leaks, your idle problem may be due to a clogged or faulty IAC valve. It's the device attached to the bottom of the throttle body that controls airflow at idle when the throttle plate is closed. Over time, the little roller in there can get sticky, or the electronics inside the thing wear out. This thing is well documented over at m.net... do a search on the fixes.
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Originally Posted by Exhondaman
(Post 114682)
Isnt stock boost 5.5?
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As fas as I know stock flywheel and it drives like a stock flywheel...
DASHPOT??? I will check the vacum hoses and IAC valve.. Thanx |
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Read completely through the FAQ for some good info:
https://www.miataturbo.net/forums/showthread.php?t=4288 I think most of us will agree that your next step needs to be something to get the intake charge temps down. You need an IC or WaterInjection. Do you have PowerSteering or A/C? The low boost you're running now probably won't cause any knocking problems yet, but sumnmer is here and it's getting hotter. Without an IC, if you want to up the boost more than about 6psi, you'll have to pull too much timing for knock prevention to make it worth it. After you get the intake temps down, you're going to be interested in a stronger fuel pump. I was running 1.8's really rich up to around 170whp @130psi of fuel pressure. Now I'm running 305's@100psi of fuel pressure @12psi boost for 190whp. Obviously lower fuel pressure is better, but I had no problems with flow in the 130psi range. Of course you can only run so large an injector on the stock ECU. 330's seem to be the recognized upper limit for good idle characteristics. So, get yourself and IC or WI and turn boost up to 7psi. Then get a fuel pump and you should be set for 10-11psi. For more boost, invest in bigger injectors so you can get the fuel pressure down. You'll need a fuel pressure gauge and an assortment of Vortech discs. You can tune based on the match and other setups, or you can get a Wideband, or get on a dyno. Just to make sure, you're using the highest octane available to you, right? You have budgeted for a clutch? You'll need one above your current power level. What other mods are on your car? Post some pics in the vbGarage and give a full writeup. Fill out your sig too. You can install the cat/exhaust, get a decent IC, get an appropriate disc for the vortech, and you shouldn't have any problems running up to about 10-12psi on the |
Yes, Power Steering and A/C w/o belt on and running high pump gas....
Clutch replaced last year OEM replacement Exedy (according to prev. owner) NO knocking so far..... Fuel pump suggestions? stock 1.8 or??? I want to do an IC, any suggestions? cost effective? what do you think of the ones on ebay for 69? Stupid ?, but I am new to turbos.....How do I increase boost? |
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