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Join Date: Mar 2004
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With some tuning I've got it so it is running 13.5-14.0 AFR's at steady state cruise and 10.0-11.0 at full boost. I had it on the dyno today to confirm and it pulled 330 HP and 321 lbft at the wheels on the Dynojet at Carburetor Connection in Kirkland WA. That was with a 0.5 bar spring still in the wastegate. It has a boost spike that builds from 0.5 to 0.8 bar from 4k to 5.5k rpm, and then it drops back down to a steady 0.5 bar till 7k redline.



You can see on the dyno chart where boost settles from 0.8 bar back down to 0.5 bar at 5,500 rpm. After talking with Chris C at Turbokraft, the next step is to install an electronic boost controller and start turning up the wick. The EBC should mask the spike and incorporate into the higher boost levels. Chris feels it should be safe up to 1.0 bar with his intercooler and the 964 cams which lower the dynamic compression a bit. Hope to have the EBC on ASAP, see about what retuning is needed, and then return to the dyno to document the improvements.
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Brooke
1969 911 ST 3.8 EFI ITB - Irish Green, 1973 911 RS tribute 3.3 turbo - Gulf Blue, 1974 911 IROC 3.2 EFI - Black, Beck 904 2.8 project - Silver, 1996 993 C2 - Polar Silver

2006 Forester STI - the parts hauler, 1992 BMW 325 Cab S52 M3 - The Scooter

Last edited by rswannabe; 11-14-2017 at 12:10 AM..
Old 11-10-2017, 10:36 PM
  Pelican Parts Technical Article Directory    Reply With Quote #41 (permalink)
3 restos WIP = psycho
 
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I misunderstood the boost spike when you mentioned it earlier today. I thought it was when the wastegate transitioned from closed to open. Now it all makes sense.

Sent from my Nexus 6P using Tapatalk
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Old 11-10-2017, 10:43 PM
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Glad you're liking it!
Thanks, again, for the feedback -- we're incorporating those changes into the next iteration.
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Old 11-11-2017, 12:06 PM
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Turbofrog
 
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Thats the exact IC I refered to. You made a good choise.

As for boost control, have you thought about having a coarse fuel control with the boost control? That would leave engine still CIS but you would have a bit control over revs/map/AFR. FrankenCIS or AIC-1 can do it AIC being much cheaper I would guess. I have a spare unit if you are interested. I went EFI so now I have two of those but I'd like to keep one if I ever return to CIS. It drove really well with it even though I did not use boost control other than MBC.
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Old 11-12-2017, 09:09 PM
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Quote:
Originally Posted by rswannabe View Post
Time to update this thread. It has been a while because I got sidetracked on this project by the rebuild of the 2.8 in my '69 ST, subsequently replacing that motor with a 3.8, and needing to rebuild the 3.3 in this car due to excessive blowby. Turns out the turbo had multiple shattered rings and had scarred some of the pistons. So we rebuilt the motor with new JE 8.0:1 pistons and rebuilt the heads while we were in there. The heads got twin plugged as well, but I am still running single plug ignition for now.

With the rebuild I installed the GHL headers, the Rarelyl8 hooligan muffler, Leask adjustable WUR and RPM switch, and a Turbokraft big intercooler to fit under the ducktail. Yes, I reversed course on the no intercooler plan I previously had. I decided I just wanted the greater safety factor and didn't want the added complexity of the water meth injection.

With the installation of the new intercooler I had to relocate the WUR, so I fabricated a new bracket for it. While doing that I went ahead and made it so the WUR could be adjusted without unbolting it from the bracket.





The new intercooler is a significant increase in capacity and efficiency over the stock unit and just clears the ducktail. An added benefit is this setup uses the upgraded 964 style recirculation valve for better on/off boost transition.





I also swapped out the restrictive pancake air filter for a freer flowing KN unit.

Did you have to special order this intercooler from TK? I am having trouble locating this on their website.
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1976 911S Signature Edition
3.2SSt (JE 98mm 9.5:1 pistons, 964 Cams, ARP Rod Bolts, Big Port SC Heads, 3.2 Carrera Manifold, ID725's, B&B Headers, Tial 44mm, TS RacePort, BW S360, AEM Infinity 506, E85)
Old 11-13-2017, 10:13 AM
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Quote:
Originally Posted by '76 911S 3.0 View Post
Did you have to special order this intercooler from TK? I am having trouble locating this on their website.
Not on our site, these are custom made to order. Please call us to discuss. Thank you.
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Old 11-13-2017, 10:18 AM
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You get that new wastegate installed yet.....

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Old 11-22-2017, 08:08 AM
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I did and it is working well, but its been too damn wet to start turning up the boost. I'll post a detailed narrative on this soon.
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Brooke
1969 911 ST 3.8 EFI ITB - Irish Green, 1973 911 RS tribute 3.3 turbo - Gulf Blue, 1974 911 IROC 3.2 EFI - Black, Beck 904 2.8 project - Silver, 1996 993 C2 - Polar Silver

2006 Forester STI - the parts hauler, 1992 BMW 325 Cab S52 M3 - The Scooter
Old 11-22-2017, 08:21 AM
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Awesome! What boost level is it holding on just the spring (with the EBC turned off)?
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- 2006 Infiniti M45 Sport
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Old 11-22-2017, 09:12 AM
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It’s holding a steady 0.2 bar through redline with the EBC off. No creep or spike at all.
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Brooke
1969 911 ST 3.8 EFI ITB - Irish Green, 1973 911 RS tribute 3.3 turbo - Gulf Blue, 1974 911 IROC 3.2 EFI - Black, Beck 904 2.8 project - Silver, 1996 993 C2 - Polar Silver

2006 Forester STI - the parts hauler, 1992 BMW 325 Cab S52 M3 - The Scooter
Old 11-22-2017, 09:39 AM
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Brando
 
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I love that fing car
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Turbo powa!
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Old 11-22-2017, 10:14 AM
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Good to hear that the yellow spring is doing its job.
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- 2006 Infiniti M45 Sport
https://medium.com/@crashingdoor
Old 11-22-2017, 11:05 AM
  Pelican Parts Technical Article Directory    Reply With Quote #52 (permalink)
 
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