Does This Car Haul Ass in Cold Weather or WHAT?
BDC Motorsports
Joined: Jun 2002
Posts: 3,667
Likes: 6
From: Grand Prairie, TX
Yeah that is a bit better fuel then most people are able to get on this forum. And that should to be taken into consideration when comparing what AFR's people are running at certain boost levels.
I do agree with BDC here that its pushing the limits @ 18 psi. With 94 octane i would feel 11.5 @ 15 psi is about as far as i would go. then probably taper to 11.1-11.2 @ 18 psi. But i don't know the details of thewird's setup. With lower compression rotors for instance you could run higher AFR's at a given boost level.
On the other hand some people manage to live on the edge for years without anything going wrong. While other people can go through several motors while being extra careful.
Brent
I do agree with BDC here that its pushing the limits @ 18 psi. With 94 octane i would feel 11.5 @ 15 psi is about as far as i would go. then probably taper to 11.1-11.2 @ 18 psi. But i don't know the details of thewird's setup. With lower compression rotors for instance you could run higher AFR's at a given boost level.
On the other hand some people manage to live on the edge for years without anything going wrong. While other people can go through several motors while being extra careful.
Brent
Btw, sorry for hijacking a thread if I did!
B
Constant threat
Joined: Jul 2001
Posts: 4,968
Likes: 39
From: near Wichita, Kansas
Now imagine the extra ponies the nice cool weather brings to life, coupled with the momentary lag I have with my automatic tranny. About the time the car decides to go...it REALLY goes! Unpredictable, sometimes. Not for the uneducated.
Thread Starter
Banned. I got OWNED!!!
Joined: Jul 2008
Posts: 529
Likes: 0
From: NC
I'm seeing 11.7 tonight (13-14 degrees advance)....it pulls hard!
comment from BDC: "Colder weather is a blessing. Everything is more efficient -- oil and water temps lower, air charge temps lower, air compressor more efficient, exhaust temps lower, engine bay temps, etc"
comment from BDC: "Colder weather is a blessing. Everything is more efficient -- oil and water temps lower, air charge temps lower, air compressor more efficient, exhaust temps lower, engine bay temps, etc"
So just out of curiosity, I bought a '94 RX7 from RickRX7 in Washington last month (28K miles and steve kan tuned, this car is mint!) and the tune that steve put into the PFC is targeting a 10.9 - 11.0 AFR. The Dyno slip is showing that the AFR goes as high as 11.1-11.2 at 7K RPMS and I am pushing 13psi on the stock turbos Is this considered rich or just conservative? I have read a number of posts (and discussed this with the folks at kantuning) and it seems to be solid, with the idea that I should back off the bost to about 12.5 to ehance the life of the stock turbos.
BTW, I drove it on thanksgiving as well in the cool Chicago air, and it pulled like an SOB, but the boost also spike to 13.5. Needless to say the car is parked now that snow is on the ground, but should I be concerned?
BTW, I drove it on thanksgiving as well in the cool Chicago air, and it pulled like an SOB, but the boost also spike to 13.5. Needless to say the car is parked now that snow is on the ground, but should I be concerned?
One other thing: what bracket is that you have holding your AST? It looks a lot nicer than my home depot version
Your car is so clean, keep it that way!
Yup, 
https://www.rx7club.com/canadian-forum-42/tuning-complete-804396/ . I can't sleep without my baby running 
thewird
https://www.rx7club.com/canadian-forum-42/tuning-complete-804396/ . I can't sleep without my baby running thewird
My understanding is that just because your boost gauge reads 10psi doesn't mean that there is the same amount of air flowing as a showroom stock FD. Pressure and flow are not always directly proportional.
That is true. More air will be consumed by a modified engine at the same 10 psi. But the stock maps are so rich that it would be pretty much impossible to get enough air into the engine that it would run lean at 10 psi. Whats dangerous is exceeding the 10 psi and hitting fuel cut
Last edited by Dudemaaanownsanrx7; Dec 6, 2008 at 04:42 PM.
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