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C900 Performance, Mods & Tuning Covers Tuning & Performance modifications for the Classic 900 (C900)

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  #1  
Old 13th October 2011
SG SG is offline
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Default finished my projekt



miles per gallon? No No smiles per miles
cheers
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  #2  
Old 13th October 2011
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jamengual jamengual is offline
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how did you do that ?
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  #3  
Old 13th October 2011
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Holy *hit. That's fast. Ai ai ai!!!

SG you should've shown this one as well:
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  #4  
Old 14th October 2011
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Krizzie Krizzie is offline
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So how's the tranny holding up?
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  #5  
Old 14th October 2011
SG SG is offline
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Trannys fine. Chillcast housing with ┤92 internals strenhtened. Busted the primary chains with 8th primary twice though so I sold the 8th and with 7th its fine. Torque is restricted to 400 nm so it┤ll be OK i think, hp dont kill trannys only early quick building torque at low rpm. Look at the 100-200 4th gear acc. boost rises fron 1.bar at low rpm to 1.3 at the rev limit.

Beat an M5 yesterday from 110 to 220, He looked funny in the face
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  #6  
Old 14th October 2011
SG SG is offline
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Quote:
Originally Posted by jamengual View Post
how did you do that ?
Long story.
trionic 5.5 T5 suite mapped,
siemens injectors 630cc
3 bar FPR
big open air intake
2.5" pressure pipes,
large FMIC aluminium
2.1 intake
2,1/2,3 head with 9-5 hydraulic lifters
stock b202 with T8 pistons.
tubular header
3" downpipe+ 2.5" simons with 2 silencers (no noise)
GT3076 with 0.64 exhaust housing
externally gated turbosmart 44 mm
stock cams adjustable with 1.2 mm valve over... whats it called?
sachs pressure plate 400 nm

chillcast gearbox with 5 speed internals strengthened
JE shortshift
koni shocks lesj÷fors springs
1 gear baseboost. second gear max 0.9 bar (hate wheelspin)
3-5 geaar full pressure,
thats about it.

Last edited by SG; 14th October 2011 at 05:10 PM.
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  #7  
Old 14th October 2011
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li Arc li Arc is offline
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Holy crap impressive! I didn't think a B202 /w T8 pistons (like my '85 block) was a good mate with the 2.1L head, but I guess that gives you a pretty low compression ratio. Is it a T5 or T7 head, or just a regular c900 head? Makes me wonder if MS is the right route...

I would've loved to see the reaction on the face of the guy driving the M5. Wish I had my 5-speed internals strengthened in the chillcast, but I don't necessarily need (or could produce) accel like that! I'm surprised you could keep wheel-spin to a minimum against an RWD. Did you have like super strong springs in the back? Mine are 650 lb/in, but I doubt it could keep the front on the ground when it counted.

li Arc
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  #8  
Old 14th October 2011
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SaabCrazee SaabCrazee is offline
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Red Line? We don't need no stinking red line...

Sweet! and faast!
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  #9  
Old 14th October 2011
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Quote:
Originally Posted by SG View Post
Beat an M5 yesterday from 110 to 220, He looked funny in the face
Yes... I'll bet he did!
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  #10  
Old 14th October 2011
SG SG is offline
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Quote:
Originally Posted by li Arc View Post
Holy crap impressive! I didn't think a B202 /w T8 pistons (like my '85 block) was a good mate with the 2.1L head, but I guess that gives you a pretty low compression ratio. Is it a T5 or T7 head, or just a regular c900 head? Makes me wonder if MS is the right route...

I would've loved to see the reaction on the face of the guy driving the M5. Wish I had my 5-speed internals strengthened in the chillcast, but I don't necessarily need (or could produce) accel like that! I'm surprised you could keep wheel-spin to a minimum against an RWD. Did you have like super strong springs in the back? Mine are 650 lb/in, but I doubt it could keep the front on the ground when it counted.

li Arc
IIRC there are 2 kinds of T8 pistons, pre APC and APC pistons. I use the late ones and they shouldn┤t lower the compression ratio as much. I forgot to write it but we modified the 2.3 head by removing some material to make it smooth and round. I think it was equal to 2 ml of fluid in each chamber. I dont know for sure but my guess is compression ratio is 1:8.75 or close to that.

No super strong springs in the back. remember it was 110-220 we raced.

The M5 would probably win from 0-200 because of my FWD and manual gearbox, but wheelspin is no problem. Thats the beauty of T5.5, it allows you to restrict boost in 1st and 2nd gear, and because I let boost slowly increase in 3th it doesn┤t spin.

check out 4th gear:

could be faster with more low end boost, but tranny would suffer and 3th gear spin (tried that)

Last edited by SG; 14th October 2011 at 05:09 PM.
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  #11  
Old 14th October 2011
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jamengual jamengual is offline
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where is the recipe ?
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  #12  
Old 15th October 2011
SG SG is offline
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Quote:
Originally Posted by jamengual View Post
where is the recipe ?
hardware changes are mentioned above. You need complete trionic 5.5 from a donor car. A bit tricky to build on to the car, had help from a skilled guy. then you download T5 suite and with a laptop and canbus you can map the car while driving. I can e-mail my binfile to anyone interestet. just sent pm.
I hope I answered your question.
cheers
SG
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