Why didn't I order a Steve Wong chip sooner?
 

Wow, what a difference in the mid-range of the power band. My car had an obnoxious hesitation right around 3000 RPMs that made it annoying in any normal driving. I replaced the plugs, air filter, fuel filter, distributor cap, wires, and it still persisted.

Well I put the SW chip in Friday and it was immediately gone. The car is so much more enjoyable to drive on the streets as the powerband is far less peaky and far more usable from 2500 - 4000 RPMs.

Overall, the swap took about 30 minutes, the hardest part being bolting the Motronic back down underneath the seat due to the awkward access.

http://i.imgur.com/6w9J78T.jpg

Cool. I have a Steve Wong chip installed for my '87 3.2 motor with 964 cams. I can't wait to drive it and see how it runs.

Nice!

I'd love to see what a difference 964 cams make as well.

SW chip + M&K premuffler / 1-in, 1-out muffler = 211 RWHP (dynojet dyno recently), which is a big increase over stock. Silky smooth torque and hp curves.

Nice.

I have a Monty muffler but a stock cat. I considered a premuffler but didn't want to fool with it with our emissions inspections.

My 87 doesn't exhibit that hesitation. AFM perhaps ?

Even on the streets, I try to keep it above 3K rpm.

Nice!! I've had my eye on an SW chip for a while. Which one did you get, the stock or the pre-muffler one?

Also, and I don't mean to thread drift too much here, this hesitation around 3000, was it persistent or more of a random thing? I ask because my '89 3.2 does something similar, but not on any frequency I can determine. Just sometimes while driving (and it normally happens when cruising for a while) it will start to act like it's missing or hesitating in the 3000-4000 range, and not everytime I drive it. The only consistency is that it happens around the same RPM range, but other than that, I have not been able to figure out a cause (not that I've really looked to deep into yet, getting other issues squared away first).

I try to as well but with long gearing, stop signs, traffic, and lights, it's not always a possibility. A number of other people have noted a similar hesitation and mentioned the chip curing it. Could it be the air flow meter? Possibly, but I'm not going to worry about it now.

Stock.

Yes, this sounds exactly like the issue I was having. It wasn't every time, but occasionally right around 3000 RPMs and it felt like there was a pause with the throttle but with no associated noise indicating something wrong.

I just did 91 octance premuff chip, MK premuffler, and 1 in 1 out MK -- brilliant. same as OP -- can't believe I didn't sooner and as jeff bottman has said to me in the past -- I'm now a bit of an evangelist for this set up. lighter faster and relatively cheap -- what's not to like

Looking at the dyno charts on the SW site, I see many where the torque curve takes a dip around 3K but that happens for both OEM and chipped runs.

http://www.911chips.com/dyno.html

Drop the cat if you can. Just keep it if you need to have an inspection done.
Typically there is no emissions on 30 year old cars but your state maybe different.
Have the SW chip /MK pre muffler with stock exhaust.
So nice.

Overall, the swap took about 30 minutes, the hardest part being bolting the Motronic back down underneath the seat due to the awkward access.


I find it's easier to remove the drivers seat to get to the brain box.

Thanks for the reply. I guess that gives me another reason to get the SW chip, not that I think it'll for sure stop the missing, but with the other gains and possibility of helping out there, there's no reason to not upgrade.

OK, I'm a shameless promoter of Steve Wong chips and M&K products. Here's the Dynojet dyno curves for stock '86 targa, Wong chip, M&K premuffler and 1-in 1-out muffler:

http://forums.pelicanparts.com/uploa...1461033575.jpg

Good to hear another positive response on the chip swap, SmileWavy did mine a few years ago, and wouldnt go back to the standard chip now.
Steve's a good guy to deal with too. :)
A.

One of the best mods I've done for my car a few years back. Immediately noticeable difference.

Why is there is a dip in AFR at 5000rpm?

I did a bursch cat bypass and one in one out exhaust on my 87 911 3.2. I also did the Steve Wong chip this week. Wow, what a difference.....it pulls so much harder in the lower RPM range and the idle is smooth as glass. I had to adjust my idle down 200 RPMs after the chip and I made sure to disconnect the brown wire for emissions ( I guess I have a California spec 911?) I still need to check and make sure I'm getting 100% throttle open when pedal is pressed, but I did a minor adjustment already. Money well spent! I got the 91 octane chip for my setup in case I go out west with it.

I will also say they mailed it the same day I ordered it and it was sent priority mail to my house in about 3 days and I live in Georgia. Great customer service. It came with all the instructions and I feel they went above and beyond when it came to everything.