Club G40 Forum
Technical => Engine and Transmission => Topic started by: vwnut on January 25, 2014, 06:01:30 pm
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Hi, Some advise please!
Fully rebuilt engine with wossner piston 1341cc bottom end, rebuilt R1 supercharger, Piper cam, gas flowed Jabbasport big valve head, 315cc injectors, Jabbasport chip to suit engine spec, PPP exhaust manifold and system, lightened flywheel and fully balanced bottom end, 65mm toothed pulley kit, running 186BHP and 164lb.ft torque. Rev limiter cutting in around 6,300RPM. Happy with this, but engine wants to give more.
How can I increase rev limiter to 7000RPM?
Thanks
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What map (chip) is in the car currently?
Andy can put a custom rev limit on any of the PPP maps :)
Good power already! Is it still making power at the red line?
Stick a RR curve up, 180bhp+ is impressive 8)
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Really impressive figures dude with the lader! Get a RR print out up!
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Thanks guys,
Yup, still making power at red line, with good steadily increasing power curve on attached RR plot.
Engine is fueling perfectly at the moment with 11.5 : 1 AFR through the full rev range.
Is a different chip required to increase the RPM, or is there another way of achieving this?
Will there be an advantage in changing to PPP chip?
Thanks.
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Peter- It would benefit from a full map given the spec, or PPP G40 #005 map at the least (with rev limiter to suit).
11.5:1 is fairly rich, at those power levels you'd be wise to fit 250cc injectors and gain some drivability and economy back :)
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If your power delivery is similar to mine then id go for the increased limiter
6k is pretty low, mine carrys on producing power and steaming on past the 7k mark (though i dont like doing it)
it also feels good to chase the power and really scream it out in the gears
but being a glader this is no good for it, it doesnt like revving too high (though its much better than hitting a lower rev limter)
i only take mine to over 7k once in a blue moon, sounds epic but it cant be healthy for the glader (mine has been rebuilt 7k ago and ill be doing it again in 5k anyway to keep it well within limits :)
Taylor
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How does the engine itself cope with a 7000 rpm limit? Could the valves start floating for example? And how about the piston speed?
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the little 1.3's are well capable and revvy :)
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Thanks for the suggestions and feedback. :)
Tha car is inteneded primarily for the track and occasional road use (Helix paddle clutch is OK once you get used to it!).
I am therefore not too concerned about fuel economy (achieveed 33.13MPG on last tank full on normal road driving - reasonable!) and would prefer to be slightly rich instead of running lean and risking burning out pistons and exhaust valves. Would you consider 11.5 : 1 is over fueling with the risk of cylinder bore wash? If so I will need to look at 250cc injectors.
Bottom end also has steel conrods and studs instead of bolts for cylinder head connection, to make overall more robust, so engine will cope with over 7000RPM, but as Taylor confirmed charger is the limiting factor, so only plan occasional engine speeds up to 7000RPM!
Pete, what is required for a full map with 7K limit? Is this simply a new PPP chip and check/adjust fueling AFR, or is any more required? I live in Fife in Scotland so not sure where the best place is to go to get this done? The car was rolling road set up by Sitech Racing in Rosyth, with timing advanced as far as was safe to run with Shell V Power and the chip as supplied by Jabbsport fitted to the ECU (no reference number I could see on the chip when fitted, but according to Brian at Jabbasport the correct chip for my engine spec).
Overall I am pleased with the engine power and delivery - just want to see if I can get more!
By the way Quaife LSD also fitted to serviced gearbox.
Thanks again
Peter
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Peter - 11.5:1 okay for track, although I'd not expect it to be so rich throughout WOT.
I'd use the 250cc injectors, you'll have better fuel control (and better idle stability) no need to run 315cc on this spec really. You shouldn't wash the bore at the sort of AFR (mine runs as rich, and no problems..)
Full map takes a day, starts with inspecting everything mechanical and a chat to see what you use the car for. Base ignition timing checked and reset, wideband lambda fitted (and knock box), and then several hours of driving (and some fuel) later, out pops a custom map :D
E-mail Andy: chips@poloperformanceparts.co.uk we have done several G40s of similar spec to this, which would be a better starting point than any other off the shelf map I'm sure.
Cheers,
Pete
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Thanks Pete - will do.
Regards
Peter
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Mine has been mapped by PPP and i have pretty much the same spec except i dont have BVH. Think andy also has the map he made for me when i did have a BVH.
I recommend PPP mapping to anyone. Some good power figs as well. Will be interesting to see what mine makes at aldon rollers this coming weekend.
Cant remember exactly what andy said but i think my peak power is 7100rpm and the limit is a few more rpms above.
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Don't race an Supra's on the way... ;)
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Haha not this time. Hopefully see you at aldon if your attending?
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Jezza,
How did the rolling road go? Can you post a print out?
I am waiting to hear from Andy on my chip / map.
Peter
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My graph is in the "ongoing Projects" section
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Think your map would work well on my car jezza? Anything has got to be better than is Psd shite I have at the momemt
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I've got lots of 'flavours' of our maps, and frequently mix up a bit of a cocktail of fuel and ignition maps so could find you something a bit more tailored to your car Taylor.
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Andy that would be bang on mate!
Want to eventually get a full map, but Ive decided I want to go big or go home soo will eventually be going turbo to keep up with Ryan, but want something for now as the current map could be for a dacia sandera for how it runs!
What flavours do you do?
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Email your full engine spec to chips@poloperformanceparts.co.uk and I'll let you know what options you've got.