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Porken's 85 chips- Awesome!

 
Old 11-30-2009, 07:42 PM
  #16  
svp928
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Ryan:
www dot liftbars dot com
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Old 11-30-2009, 09:27 PM
  #17  
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FWIW, just finished smog in the Bay Area over the weekend, with the Porken chips and '87 FPR since July --> passed with readings well below avg levels and the smog guy was surprised how clean it was for a 23yr old stock vehicle.

I was a little nervous that perhaps it would increase emissions a bit, but wow it was clean as a whistle, just like it always is.

Excellent job Ken!!
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Old 12-01-2009, 12:03 AM
  #18  
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I started with the 1.4 version in July along with a '87 55 psi FPR. Performance was great idle was a little rough on cold starts. Ken then sent out ( for free) a upgraded version of the 1.4 and idle was smooth, but Ken was not happy with overall performance and sent out (again free) the 2.0 version.
The 2.0 is fantastic, excellent throtle response and very smooth through out the entire rpm range. I also noticed that when outside temps are cool and cool air is entering the intakes it seems to give even more of a kick.
All I can say is that Ken has done a fantastic job with tuning these chips and are a must for any MY '85 '86.
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Old 12-01-2009, 12:11 AM
  #19  
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Alright...alright...how much do the damn things cost...You guys are gonna get me in trouble.
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Old 12-01-2009, 12:22 AM
  #20  
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Considering that I paid $450.00 for authentic A.A. chips a while back and they did NOT upgrade them and if they did they would not do it for FREE I think you will be very pleased with what Ken is offering.
I know I am
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Old 12-01-2009, 01:13 AM
  #21  
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Originally Posted by svp928 View Post
Forgot to mention, I asked Ken for the 9000 rpm version, and I figure about 517 hp at that rpm....

Just kidding! But it does run really well between 4500 and 6500, and the flat spot at around 3500 is much less abrupt.
I did raise the rev limit a little to 6550. (This makes the auto able to hit 80 mph in 2nd. Although AutoThority claims a +300 rev limit increase, looking at the code, I found the limit was unchanged at the stock 6400.)

The flat spot may disappear with v2.0 of the EZF chip (which you should recieve in a day or two). With v2.0, the air temp retard is based on how much load there is, so even as air temps rise, the transition is smooth. If you accelerate after sitting at a long light, you may feel a little less power, but as the airbox fills with cooler air, you can feel the power claw it's way out again.

I was never satisfied with the heavy handed retard when the airbox temps went up, so in v2.0 I wrote new hex code, and reused the unused WOT map space to create a three dimensional, load x air temp retard map. I also rescaled the air temp axis to match the actual airbox temps seen when running. Plus, for additional safety, I made a superhot 135F/57C extra retard step.
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Old 12-01-2009, 03:06 AM
  #22  
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The next step are new cams.The flat top above 5000 rpm is a little bit boring.
On the autobahn at high speed the engine feels a little bit weak and I think here are the next 30 HP.
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Old 12-01-2009, 09:53 AM
  #23  
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dont the 86.5's have the best cams of the lot?
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Old 12-01-2009, 10:01 AM
  #24  
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Sorry for interrupting. Do they even make chip for the 1980 928?? Thanks.
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Old 12-01-2009, 11:36 AM
  #25  
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Originally Posted by porsche 928 RI View Post
dont the 86.5's have the best cams of the lot?
S3 cams are supposed to be about most aggressive of the stock 928 cams (I think they are very similar to the GT cams) but there is no difference between the '85-'86 and the '86.5 cams.
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Old 12-01-2009, 11:49 AM
  #26  
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Originally Posted by Mike Frye View Post
S3 cams are supposed to be about most aggressive of the stock 928 cams (I think they are very similar to the GT cams) but there is no difference between the '85-'86 and the '86.5 cams.
I thought the GT cams are the most aggressive of the lot, closely followed by S3 cams. That's why the idle for GT's is set to 775 instead of 675 for all other 928's? Or do earlier 928's idle higher also?

Dan
'91 928GT S/C 475hp/460lb.ft
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Old 12-01-2009, 11:51 AM
  #27  
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Originally Posted by dprantl View Post
I thought the GT cams are the most aggressive of the lot, closely followed by S3 cams. That's why the idle for GT's is set to 775 instead of 675 for all other 928's? Or do earlier 928's idle higher also?

Dan
'91 928GT S/C 475hp/460lb.ft
You're probably right. I just know that the S3s are all the same and that they're suppposedly more aggressive than anything but the GT cams.

Higher idle for earlier MYs? Only if they have unmetered air leaks.
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Old 12-01-2009, 01:14 PM
  #28  
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The problem are the little valves of the S 3.You need more opening for more power at high rpm`s.
Look at Ken┤s webside the dynosheets.Over 5000 rpm is very little gain in HP.Airrestricted engine at high rpm.
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Old 12-01-2009, 01:18 PM
  #29  
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It would be nice to have more top end - at least to brag about. My chips fatten up the torque and hp from idle up, extend the torque way past 5000 rpm, and hp to redline, but can't lift the peaks much farther than 300 rwhp w/ X-pipe because of the valve size. (All the dyno graphs so far have been with automatics, a 5-speed may lift the lid to 310+! )

Smaller valves promote higher air velocity/swirl, so they can make more power at low rpms, where most people drive, and makes the S3 more responsive than S4-up. (darklands/Karsten is one of the few people that can run over 5000 rpm for hours at a time in a S3. )

GT cams are S3 cams but ground with the intake cam advanced 8░. Duration and lift are the same. The S3 has a lobe separation angle of 114░ whereas the GT LSA is 110░. AFAIK, tighter LSA means more power in a narrow range, at higher rpm, but a less smooth idle, hence the higher idle speed (and manual only). Colin's new cams are cast at (the superior) 114░.
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Old 12-01-2009, 01:45 PM
  #30  
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LOL Ken!But highspeeddriving on the autobahn is good for low mpg! ;-)

Ok,I go with my 5 speed to the dyno!
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