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Old 09-10-2007, 07:37 AM   #1
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Default NA vs FI , before and after, low end talk.

Just wondering whats your before and after performance (low end) Vaccum driving. Not the boosted portion.

Did anyone had a big difference after you turboed your car?
- lack of thottle responds?
- lost of power before boost?
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Old 09-10-2007, 09:06 AM   #2
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I feel less power b4 boost because my timing is now 8*, where as I had it at 16* b4 FI.
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Old 09-10-2007, 11:05 AM   #3
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interesting question for me since i never had boost, do you feel that is the only reason your feeling less power, and if you had some kind of EMU you could run 16* and have it retard at higher RPM, rigth...i mean please correct if im wrong, i am a newb at thie phenomena called boost(aka Nirvana)
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Old 09-10-2007, 11:10 AM   #4
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Quote:
Originally Posted by whaaamx5 View Post
interesting question for me since i never had boost, do you feel that is the only reason your feeling less power, and if you had some kind of EMU you could run 16* and have it retard at higher RPM, rigth...i mean please correct if im wrong, i am a newb at thie phenomena called boost(aka Nirvana)
I am adjusting my timing with EMB on the non boosted portion... still there is a trade off .. u will lose power and responds. How much power is lost? I can't reckon. It also depends on how your pipings are set up, intercooler size that's used.

Just want to see other's comments on this issue.
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Old 09-10-2007, 11:18 AM   #5
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Quote:
Originally Posted by Mimime View Post
Did anyone had a big difference after you turboed your car?

- lack of thottle responds?

- lost of power before boost?
+100rwhp difference.

no, didnt touch my throttle cable.

no.
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Old 09-10-2007, 11:53 AM   #6
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Originally Posted by Braineack View Post
+100rwhp difference.

no, didnt touch my throttle cable.

no.

Please comment on your non boosted range.
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Old 09-10-2007, 02:58 PM   #7
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Why is this even a question? Are you having trouble with your car?

Throttle response is the same. Power in vacuum is the same as I run 14 degrees timing and pull 6 with a Bipes. Once the turbo starts spooling (probably around 3000 and into boost at 4000) there is obviously more power.
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Old 09-10-2007, 03:21 PM   #8
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In my mind, it feels like the low end is better. I think it's because I finally got rid of the stock exhaust and catalytic converter as well as the stock intake arm/box and AFM.
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Old 09-10-2007, 03:38 PM   #9
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Quote:
Originally Posted by Mimime View Post
Please comment on your non boosted range.

it's barely out of boost, but it's completely transparent below the boost threshold.
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Old 09-10-2007, 03:44 PM   #10
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I felt like I picked up a little torque out of boost I would assume with the change in exhaust. Don't have anything other than my *** to back that up though.

Even with the slow spooling greddy turbo I'm not out of boost for very long.
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Old 09-10-2007, 03:56 PM   #11
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very interesting feedback...i was affraid that i may lose some pre-boost power since im in love with this lady called auto-x, and a significant loss of power in low RPM would make me mad...but based on what you guys are saying im no longer worried...damn im running out of excuses to boost my baby
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Old 09-10-2007, 03:58 PM   #12
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Quote:
Originally Posted by whaaamx5 View Post
very interesting feedback...i was affraid that i may lose some pre-boost power since im in love with this lady called auto-x, and a significant loss of power in low RPM would make me mad...but based on what you guys are saying im no longer worried...damn im running out of excuses to boost my baby
There are no excuses to not do it unless you consider class specification a problem.
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Old 09-10-2007, 04:23 PM   #13
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Quote:
Originally Posted by whaaamx5 View Post
very interesting feedback...i was affraid that i may lose some pre-boost power since im in love with this lady called auto-x, and a significant loss of power in low RPM would make me mad...but based on what you guys are saying im no longer worried...damn im running out of excuses to boost my baby
The thing is, if you go with the Greddy as it is you're not going to be optimized for autocrossing because you do want the thing to spool up quicker. As it is with the stock downpipe and exhaust you're gonna get into boost around 4k rpm. If I were seriously going to autocross the car I would have the BEGI downpipe and a free flowing cat and exhaust. That is my next summer upgrade for the car actually as I want to get that boost going earlier.

In some tight corners on the course you'll be waiting for that boost to kick in with the stock setup.
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Old 09-10-2007, 04:48 PM   #14
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A lot of the SM2 Miatas I used to autox with have pulled their turbos in favor of blowers.

Mimi - I felt a great loss of throttle response after installing my kit, but I blame that on going from 14* to 6* before I got, and later pulled, my bipes. The bipes allowed me to bump the timing back to 14* and I pulled to 10* (WI) in boost. That gave a lot of the low-end back.
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Old 09-10-2007, 04:54 PM   #15
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The turbo with out a doubt will make you faster around the cones. I went from a mid pack at best finisher to top 10 (RAW) after installing the turbo and going to v710s. With 13" wheels I have no problem being in boost a LOT. A few upgrades will make the td04 spool pretty damn good. Besides, when was the last time you spend any significant amount of time below 4K while autocrossing?

My big problem now is traction, but thats a FUN problem to have.
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Old 09-10-2007, 07:03 PM   #16
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sorry guys i just realized that this is the greddy section, ooops...
Harv-im not using a greaddy set up, im brewing something myself...i got carried away with such a great post...sorry again
kotomile-i was debating the two for a while, i AM going the snail way, lol
jayc72-im typically in the top 1/4 to 1/3 now on street tires, im not expecting to be the fastest, but i would really like it... top 10 would make me very happy...
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Old 09-10-2007, 07:26 PM   #17
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If you do go turbo for autox, make sure to keep spool/response/"linearity" in mind. Those three factors are what caused my Jax autox buddies to switch to Uberchargers vs their turbos. The turbos they selected weren't the quick-spooling kind, which didn't help at the Buccaneer Region's tight courses (a lot of club4AG influence down there).
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Old 09-10-2007, 07:57 PM   #18
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auto-x is not the only factor, even though probably the most important..
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Old 09-10-2007, 08:14 PM   #19
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With proper fuel and timing control (EMU, MS, etc) as opposed to bandaids like static timing retard and 300cc injectors on the stock ECU/AFM, driveability with a turbo car in non-boosted conditions is 100% identical to stock. The turbo does not present a significant restriction to either intake or exhaust, and the fuel mixture and ignition timing should not be altered at all.
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Old 09-10-2007, 09:31 PM   #20
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I did an autox with 100% miatas. I was the second faster time of the day and the only turbo miata. only one that beat me was a stock 06.
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