Superchargerd CIS kit does 339 CHP/382 Torque
06-03-2005, 03:51 PM
#1
Developer
Thread Starter
Superchargerd CIS kit does 339 CHP/382 Torque
One of the ways our Stage 3 kit produced more HP than our Stage 2 (intercooled) supercharger kit has been the addition of a FES (Fuel Enrichment System) to assist the Control regulator on the CIS cars.
On the K-Jet (CIS) cars, if you lower the control pressure, the fuel pressure at the injectors goes up, and you get more fuel. This was done by bleeding off control system pressure back into the return line to the gas tank before now.
We purchased a system designed for the 911 by Andial Road and racing, and then modified it to perform correctly on an 8 cylinder 928. It worked, but it was difficult to install and wire and it added almost $600 to the cost of the Stage 3 kit.
We have now discovered a simpler way to bleed off control system pressure, thereby richening the fuel from all 8 injectors - and the dyno chart below shows an increase in RWHP from 279 to 295 with no other changes accept turning our FES system on and off between the two runs. Torque at the rear wheels went from 303 to 333.
This means - with the addition of our FES to our Stage 2 kit - that this M28/03 motor which was 219 CHP and 245 ftlbs is now 339 CHP and 382 ftlbs of torque. An increase of 114 HP and 138 ftlbs of torque.
The 928M FES system for K-Jet is boost-sensitive and adjustable so you can easily tune where you want your extra fuel to come in. It costs about $100 in parts and labor for us to make, so it helps keep costs down.
Our Stage 2 kit now performs better than our Stage 3 kit used to! And you can keep and use your air conditioner (which you could not on the Stage 3 kit). So we have discontinued our Stage 3 kit as just unnecessary and not cost effective any more.
On the K-Jet (CIS) cars, if you lower the control pressure, the fuel pressure at the injectors goes up, and you get more fuel. This was done by bleeding off control system pressure back into the return line to the gas tank before now.
We purchased a system designed for the 911 by Andial Road and racing, and then modified it to perform correctly on an 8 cylinder 928. It worked, but it was difficult to install and wire and it added almost $600 to the cost of the Stage 3 kit.
We have now discovered a simpler way to bleed off control system pressure, thereby richening the fuel from all 8 injectors - and the dyno chart below shows an increase in RWHP from 279 to 295 with no other changes accept turning our FES system on and off between the two runs. Torque at the rear wheels went from 303 to 333.
This means - with the addition of our FES to our Stage 2 kit - that this M28/03 motor which was 219 CHP and 245 ftlbs is now 339 CHP and 382 ftlbs of torque. An increase of 114 HP and 138 ftlbs of torque.
The 928M FES system for K-Jet is boost-sensitive and adjustable so you can easily tune where you want your extra fuel to come in. It costs about $100 in parts and labor for us to make, so it helps keep costs down.
Our Stage 2 kit now performs better than our Stage 3 kit used to! And you can keep and use your air conditioner (which you could not on the Stage 3 kit). So we have discontinued our Stage 3 kit as just unnecessary and not cost effective any more.
Last edited by Carl Fausett; 06-03-2005 at 08:10 PM.
06-03-2005, 08:08 PM
#4
Developer
Thread Starter
Yes, cats are still on it, stock exhauset manifolds, the works. BUT, now that you mention it - this car did rust thru its rear muffler last year and we replaced it with a Borla Stainless Steel cat-back system. All the same size as OEM, single exhaust.
06-06-2005, 01:01 PM
#7
Developer
Thread Starter
Darien - I do not know what you mean by a 85-85. Is that a typo?
Give me a better description of your motor please (like the M number)
Chuck - I assume you mean exhaust manifolds and cat by-pass. If that is worth 10 HP on a NA car, it will be worth a little less on a SC car - the boost tends to compensat for a lot of restrictions, and opening up the exhaust - although still a good idea - has less of a change.
Give me a better description of your motor please (like the M number)
Chuck - I assume you mean exhaust manifolds and cat by-pass. If that is worth 10 HP on a NA car, it will be worth a little less on a SC car - the boost tends to compensat for a lot of restrictions, and opening up the exhaust - although still a good idea - has less of a change.
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06-06-2005, 02:44 PM
#9
What boost level is that Carl? I don't see it in the post.
06-06-2005, 04:29 PM
#10
Developer
Thread Starter
TeufiHei: no update for L-jet are neccesary. We produce these same numbers in a L-Jet Stage 2 configuration... about 340 CHP. Want more? In an L-Jet, it is easier than a K-Jet because you can swap into larger injectors, raise the boost, and go again...
BrendanC: That chart was produced at 10 psi at 6,000 RPM on a M28/03 motor.
BrendanC: That chart was produced at 10 psi at 6,000 RPM on a M28/03 motor.
06-06-2005, 08:16 PM
#11
Rennlist Member
did you mention $$$ anywhere?
06-07-2005, 11:43 AM
#12
Developer
Thread Starter
Brad:
out of respect for the Rennlist, I try to keep things on the informative side in these posts and avoid blatent shilling of products here.
If you are interested (and I thank you for your interest) please visit any of these links to our website.
Prices and Parts Lists for the supercharger kits are here:
http://www.928motorsports.com/parts/superchargers.html
Videos of the supercharger kits installed in cars are here:
http://www.928motorsports.com/ourvideos.html
Other performance products we manufacture or sell are here:
http://www.928motorsports.com/parts.html
out of respect for the Rennlist, I try to keep things on the informative side in these posts and avoid blatent shilling of products here.
If you are interested (and I thank you for your interest) please visit any of these links to our website.
Prices and Parts Lists for the supercharger kits are here:
http://www.928motorsports.com/parts/superchargers.html
Videos of the supercharger kits installed in cars are here:
http://www.928motorsports.com/ourvideos.html
Other performance products we manufacture or sell are here:
http://www.928motorsports.com/parts.html
06-07-2005, 03:16 PM
#13
Burning Brakes
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As I understand pulsed injection theory and the capacity of the L-Jet AFM system, one has the choice either to recalibrate the AFM to support longer pulses on stock injectors, or to dupe the sytem with larger than stock injectors and the same pulse timing. From what I've read, you can either produce a longer burn or a very rich burst. Either way, the AFM is said to only be able to support about 350 CHP. Which route did you go?
I have to admit I am very tempted by your product(s) and will be ordering some things very soon.
I have to admit I am very tempted by your product(s) and will be ordering some things very soon.
06-07-2005, 03:51 PM
#14
Thanks Carl.