got my (90hp silvertop) remapped yesterday

[rkenyo]

just wanted to see what you guys think of results:-)

90bhp silvertop

spec as follows:

newman ph3 cam
baker pulley
head skim
new belts & gaskets
heatwrapped raceland 4/2/1 manifold
decat to powerflow straight through center and powerflow 3" bacbox
s1 106 rallye inlet and t/b
BMC CDA airbox
fast road clutch
lightened flywheel


It made 114BHP @ 5498 RPM
and 107 nm torque @ 4470 RPM
rev limit raised to 7000 RPM

The tester said that my BMC airbox was starving the engine and i should gain an extra 2/3BHP with a better system :-) Any suggestions? And also i have a s1 106 rallye fuel rail and injectors would adding these give me any more of an improvement.

All done on the rollers at R-tec performance in Hinckley, Leicestershire.

[Daniel09]

just wanted to see what you guys think of results:-)

90bhp silvertop

spec as follows:

newman ph3 cam
baker pulley
head skim
new belts & gaskets
heatwrapped raceland 4/2/1 manifold
decat to powerflow straight through center and powerflow 3" bacbox
s1 106 rallye inlet and t/b
BMC CDA airbox
fast road clutch
lightened flywheel


It made 114BHP @ 5498 RPM
and 107 nm torque @ 4470 RPM
rev limit raised to 7000 RPM

The tester said that my BMC airbox was starving the engine and i should gain an extra 2/3BHP with a better system :-) Any suggestions? And also i have a s1 106 rallye fuel rail and injectors would adding these give me any more of an improvement.

All done on the rollers at R-tec performance in Hinckley, Leicestershire.

cant see a BMC airbox starving an engine with only light mod's that you listed

[rkenyo]

do you think thats an ok result for mods listed then mate?

[Daniel09]

do you think thats an ok result for mods listed then mate?

yeah, its an ok figure, dont agree with your airbox restricting it tho

[rkenyo]

I don't understand why he'd say it though? surely it must have shown up on screen or something? Any other opinions also appreciated?

[Daniel09]

that airbox people use on much higher tuned engines that yours, cammed VTS's and such its not going to restrict a VTR pushing 114, if it was cheap shit induction then fair enough,

[rkenyo]

anyone else got any ideas on airbox solution?

[Gandi699]

Did you ask him what he suggested? BMC are about the best you can get hence the cost. Does it have a CAF?

[AlexB]

Who mapped it??

Bmcs arent great tbh they past basic breathing mods im not a fan mine on cams wasnt ideal ended up completely removing it to get enough air in to be able to map in the end

[blackie_2k5]

i bet the powerflow is strangling it tbh

[VTRelite]

did you do a run on an open t/b (no filter)

[KamRacing]

The same size BMC filter is used on the VTS so I doubt its restricting things, but the additional pipework could..

[rkenyo]

Thanks for the replys guys, much appreciated:-)

Yeh he did a run on an open t/b and it made 4hp more apparently

[vtr_chris90]

Are you sure it's made 107nm of torque? Because that's lost a he'll of a lot of torque over standard output

Standard is 100ft lb (136nm)
You've put 107nm which is 78ft lb which is a big difference.

Also peak power is less than standard,
Standard is 5600rpm ish iirc
with that cam you should be making higher peak than that, unless the can hasn't been adjusted from when it was fitted?

[rkenyo]

just read graph again it says max torque: 92.09 (106.95) / 4470

I spoke to the guy who fitted the cam he said it was set at default? which is bang on central on the little gauge on the adjustable pulley. Would it perform better if this was adjusted? sorry for the noob questions, im trying to learn:-)

[vtr_chris90]

right by default, im guessing that be standard?
the cam should have been set how newmans specify it, which is 110deg from tdc, which can be done using the timing disc you can get from them (about 10quid posted iirc)
then you can tweak the cam from there, i found that with my newmans cam it ran better with it retarded 2 degs and made slightly more power, every engine is different though so yours may need tweaking more or less. but tweaking the cam can change a lot of things

right ok, hmm not sure on that then, have you got a pic of the graph you could post? them 2 numbers dont add up to me (although it is late lol)

[9Freedman9]

That doesn't really look like great gains for the price you've spent!

[VinceVTS]

wow not too impressed with that lol, just seems like alot of money wasted when you could of had a vts, done all the same pretty mch and have maybe over 130hp

oh well :D

[Barry123]

I've never been that impressed with the BMC or the amount of pipework required to duct it properly. But you've done well to increase the power some 24 hp over standard. That's a 27 % increase.

[LSOfreak]

a 24bhp gain is pretty good, but for the cost of that wouldnt it have been cheaper to 16valve it to 120bhp?