Mongo

RJT I have photoshop. If you want, I can resize it.

Dennis Wilson

JT,

Your gain is great for the amount of boost you are running. Ideally, one bar (14.5 psi) should double your HP. Upping your boost to 7.25 psi (.5 bar) should give you 405 hp as long as the heat is managed and you don't run out of fuel. Have you decided what level of boost you are going to run?

Dennis

Tom. M

The recent result is their base kit...stock S4 with AT....running a 5 pound spring...so..stage 1 if you will 380 hp...(dyno pac..not dyno jet..add 10 % to get approximate dynojet #s)...I believe stage II is going to be 8 to 10 psi..and stage III will be 14 or 15..but not sure if he wants that on a stock motor... Good numbers JT....and Chuck...

atb

Tom. M

Hmm...looking at that..the flappy is not coming into play...does the boost negate the flappy effect? Interesting..and nice numbers though..

Mongo

I just noticed that too. Is the flappy even functioning????

dprantl

Pressurizing the intake makes the flappy useless since there are no more resonance waves, just pressure. In fact, on turbo cars the shorter the intake runners the better. Notice that NA 993's have VarioRam but the 993TT does not.

Dan
'91 928GT S/C

Mongo

Ah, now that makes sense. The pressure complete negates the purpose of having that extra butterfly.

89 928 turbo

Actually, using the ST we adjusted the flappy opening RPM down so that it is opening at about 2,750 rpm's for WOT and when the car is in cruise, at about 75mph we are 100% spooled up and just on the edge of going slightly positive on vacuum/boost and around 2,800 rpm's

The car itself liked to run a little richer (some varience on the ST AFR vs the Dynopac AFR due to location), but in the mid-four thousand range it tops out a bit, but the AFR is dropped into the low 11's - high 10's (on the ST)....some HP gains there, but still good performance with a safety factor for detonation. We are moving over to the EZK side to look at # engine knocks and adjust timing this week.

jt

Mongo

I can't really read the AFR graph too well, but are you saying it's running lean in upper RPMs?

89 928 turbo

Nope, it's actually going a bit rich.....12.25 or so is the target, we went into the 11's.....a little more tuning of the fuel to bring the AFR up a bit, would gain a little more HP's.

Mongo

Well I can't say running rich is bad. I've had my share of experiences running a motor lean.

Courtshark

bump... status check.

atb

They just completed a dyno run with their 7lb set up, I'm supposed to be getting the charts to post any time now. I think Chuck said he was in the 420hp range.

Courtshark

Sweet! Once I get my Shark back from the shop it's turbo time. 7 lbs sounds perfect; not too aggressive, but still very effective.

Question... is it LSD equipped? My shark is not. But that can be fixed.