Ok, Dave, I'll bite. Sounds like you're talking from experience. What mods have you done in order to increase compression? Shaved head/block, different pistons, etc.?

 

I haven't done it myself, but the PO might have done it to my car. I've spoken with a few people who claim good results from increasing the CR. In my case, I KNOW the head was rebuilt (belt failure) and suspect it may have been shaved at the time.
HERE'S WHY:
1)I've installed a Europroducts chip and a K&N.
2)I can feel a difference between 91 octane, and 93.
3)G-Tech shows a consistant 7.1 0-60, 15.2 @ 94.4 1/4 mile.

EDIT: Exhaust, MSD ignition and enlarged throttle body are next.
I can't figure out what else could have been done to allow an otherwise stock NA to generate these numbers. (OK, I did make my G-Tech passes with less than a 1/4 tank, and I don't keep anything but a couple CDs in the car, but no real weight reduction)

 

Luke, just curious, but if your car was that strong when you got it why are you doing anything to it? Won't the bigger turbo increase lag and change driveability?

J

 

[quote]Originally posted by jason952:
<strong>Luke, just curious, but if your car was that strong when you got it why are you doing anything to it? Won't the bigger turbo increase lag and change driveability?

J</strong><hr></blockquote>

well first off, what we commonly refer to as "lagg" is actually boost threshold. The k26's are 30 old technology. Mine made full boost @ 2900 rpm. I ordered basically the smallest turbo SFR sells. I got their stage one with the 54mm comp. wheel, stage 3 turbine and I opted for the #6 hotside over the #8 because there is a difference of 300rpm in their boost threshold's. With my new MAF and turbo upgrade I should be improving drivability a great deal. I expect to be making full boost @ around 2500 rpm (I also have intercooler pipes) and I will be moving a significantly larger amount of air.
In the near future I will also be stepping up to one of John Milledge's hotter cam shaft setups. He promises a little more top end power and reduced spool up time. (I've been told that our stock cam shafts are rather mild)
My ulitamate goal is to have a comfortable week end auto crosser. I have not yet been able to participate in one. I attended one, but is was held by GM and they have an 18 and over policy. (I turned 18 in sept.) With this more efficient turbo setup, I am hoping the car will respond more like a small displacment V8 than a turbo 4!!

 

I just took my car out for a quick "spin" after taking it to work today. Contrary to my earlier post, it now seems to have much more get-up-&-go than it did prior to the mods.
Does it take a while for the computer to "get used to" the new parts installed, or is it just me and the nice weather we're having today?

 

motronic opperates very s-l-o-w-l-y

 

OHhhhhhhhhh.......KAyyyyyyyyy!

Looks like I'll just have to keep driving until it reaches it's full potential!......yah...that's the ticket!

 

[quote]Originally posted by jta944:
<strong>Does it take a while for the computer to "get used to" the new parts installed, or is it just me and the nice weather we're having today?</strong><hr></blockquote>

Your 86 does not have a "learning" DME, so there should be no difference over time. That said, there's somtimes a bit of difference once some of the carbon is shook loose from *proper* driving levels. The exact reason your first dyno run is never your best.

Weather does play a crucial role... but the colder and wetter it is, the better. Warm weather robs power.

While it's true you won't get much out of the na cars without some serious mods, there are ways to liven it up a bit (and keep it SCCA ITS legal). Having finally dyno'd mine (86 w/89 engine), I'm at 143HP and 158TQ to the wheels. Stock numbers are roughly 133HP and 137TQ (89na) and 118HP and 113TQ (83-87na)[using 17.5% drrivetrain loss for all]. My bolt-on investment is relatively low (~$1k).

Good Luck!

 

Yah, when I took apart my DME/KLR to replace the chips, it looked all over the boards. There wasn't any EEPROMS, RAM, or flash-memory of any kind; there's no way this thing can record anything for future reference. The only real difference between the various incarnations of the DME is that the later ones have the program-code on the same chip as the data maps. That's really about it.