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David and I finally got our cars onto the dyno last friday morning, needless to say the shop (which specializes in LS/LT1 V8's and big block conversions & for trucks) was absolutely astounded to be seeing near LS1 torque levels on a stock 4-cyl turbo. David's '93 9000 Aero initially overboosted and hit boost cutoff at around 17 psi, but before cutting off the dyno registered like 274 lbs of torque! Once we lengthened the wastegate to bring boost down a little he ran like 205hp & 246 torque (see below.)
The 900 ran:
189 whp at 5500 rpm
196 torque at 3300 rpm
on 8psi of boost!!!!
One thing that we did and found very interesting, was a run down test, where they spin the wheels up to the speed you did a power pull at, and let the roller coast down with the clutch pushed in (so the transmission is being spun by the wheels). The dyno then measures the rate at which it slows down, and since it knows how much inertia and friction it has, the extra force that slows the roller faster is due to drivetrain losses, friction and inertia, etc. It then back calculates the power required to drive just the transmission, axles, wheels, etc and gives the finite amount of power loss in the drivetrain (less that of flywheel and clutch inertia, they are disengaged). They said most modern front transaxle cars that they have tested lose between 50-75 whp through the drivetrain. The 900 loses 23!! This tranny was rebuilt 3500mi ago too, and has been on Redline MTL synth since. Something to keep in mind!
'87 turbo block (thanks Walter Wong)
Block was reworked at Lesco Precision Machine:
Bored 0.020" over, new Mahle turbo pistons, crankshaft polished, block surfaced, line honed, all Vandervell Clevite 77 bearings, broken in on Castrol GTX 20w50, after 1500mi runs 20w50 Mobil 1 synthetic.
'91 2.1L head and intake manifold and 2.1L cams:
Has 3 angle, 2 radius race valve job from Lesco, head also surfaced,
Big intercooler pipes and 10 row intercooler (Thanks Dave K)
K&N cone filter (Swedish Dynamics)
Max Lightened Group9 Flywheel (~22lb to ~15.5lb, with a radius taken out of the outer rim where the timing marks are, again Dave K)
9" Sachs clutch for 9000 Aero
Distributor advance stop bent (JAK) base timing ~22* retards to ~13*
Custom equal length tube headers
3 bar fuel pressure regulator
Mitsubishi TE-05 12T turbo, with an old oil cooler plumbed into the water line (located where auto trans cooler used to be) to cool the water further (per Walter Wong's suggestoin); water feed is out the center of the intake manifold (also per Walter Wong).
Full 3" turbo back exhaust that David (David posts as 'Price') made from mandrel bends, has the big flared mouth out of the turbo and feeds into a 3" Heddman glasspack with no cat, and exits out in front of the drivers side rear wheel in two 2.5" slant cut tips. It is VERY loud, and sounds like a track car above 4000rpm. Just glorius.
'91 Non Turbo 5 speed, with big pinion bearing.
Black powder coated Inca wheels ($100 from the junkyard!) they weigh ~ 15lbs each.
BFG G-Force Sport tires, 205/55/15
APC Black/Black racing seats
SPG front & rear swaybars
We did all the assembly last summer, right now the whole drivetrain has 3500 miles on it.
Right now we have it boosting to 8psi, which is solid to redline, because it is all stock fuel system and injectors, and at 8psi leans to around 14.5 by redline, (I almost never drive it to redline, and at 13* timing it doesn't knock). I got a 18"X10"X2.5" front mount intercooler for x-mas which David will put in while I'm at school, then one of JAK's fuel maps and some injectors.
This combo is amazing around town, tons of torque, quick turbo spool, it's very fun to drive, and sounds absolutely ferocious, and holds steady against the stock 9000 Aero, at least until I have to shift!
I'd really like to thank Dave and Stephen Kennedy (Lesco) for all their input, recommendations, advice and experience. Their machine work os second to none, and they are extremey fair, have lots of part numbers handy and are always willing to spend some time talking over options, or just chatting. These are two people who absolutely love cars, and engines, and everything that stems from that. Thank you both.
Also, Walter Wong, for showing us what it truly means to love Saab's, he is a shining light of character for us, and is one of the greatest people who we have met through our journey to building some killer Saabs. Thank you Walter.
Thanks to all, questions welcome if there are any!
Drew
posted by 66.74.1...
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