Discussion
I know Joolz has put the results up on another thread, but I`ll put them here as well so that it shows the work involved and end results all in one place.
so to recap, the car in standard form (apart from decat) last May was 354bhp,
Since then I fitted a pair of high lift GT cams from Dave at RND Engineering, and went back to Joolz for a remap and found that the injectors were no longer able to supply enough fuel, but still achieved 377bhp.
This time I returned to Joolz with new injectors fitted, obtained from 5-0 Motorsport in the States, along with the thinned spindles and ported throttle bodies, plus Joolz design in airbox with the shorter inlet tracks, the result being a whopping 404bhp, but also now have a nice area of over 300ft/lbs of torque between 4k and 7k rpm, not bad for a 4lt.
It is difficult to accurately say how much each modification increased the power by, if I didn`t live 220miles away from Joolz it would be easy to pop in for dyno and map run between each mod!
I feel we can say however that the cams were good for 20 to 25bhp, they showed a 22bhp increase between the first 2 graphs but power was then restricted by standard injector flow rates, and when I returned the last time with the new injectors I had also ported the throttle bodies slightly and thinned the spindles, I cant see great gains had here, but a couple of hp maybe?
So if we have a difference of 27bhp to account for between the last two graphs I think its safe to assume that the mapping would roughly account for possibly 10 to 15bhp and the airbox another 10 to 15bhp, I am sure Joolz has a graph where were swapped the airbox back for the standard one as well to prove the new airbox working well, I`ll see if he can dig it out this week.
the best part was the drive back down south on saturday, until I hit the rain on the m42 and it just got worse from there on
Joolz is having some of these new airboxes made at the moment, not sure if they are to be carbon fibre or fibreglass, and he is definately the man to speak to for mapping any TVR, he can be found at ..... kitsandclassics@googlemail.com
he makes a good coffee as well
so to recap, the car in standard form (apart from decat) last May was 354bhp,
Since then I fitted a pair of high lift GT cams from Dave at RND Engineering, and went back to Joolz for a remap and found that the injectors were no longer able to supply enough fuel, but still achieved 377bhp.
This time I returned to Joolz with new injectors fitted, obtained from 5-0 Motorsport in the States, along with the thinned spindles and ported throttle bodies, plus Joolz design in airbox with the shorter inlet tracks, the result being a whopping 404bhp, but also now have a nice area of over 300ft/lbs of torque between 4k and 7k rpm, not bad for a 4lt.
It is difficult to accurately say how much each modification increased the power by, if I didn`t live 220miles away from Joolz it would be easy to pop in for dyno and map run between each mod!
I feel we can say however that the cams were good for 20 to 25bhp, they showed a 22bhp increase between the first 2 graphs but power was then restricted by standard injector flow rates, and when I returned the last time with the new injectors I had also ported the throttle bodies slightly and thinned the spindles, I cant see great gains had here, but a couple of hp maybe?
So if we have a difference of 27bhp to account for between the last two graphs I think its safe to assume that the mapping would roughly account for possibly 10 to 15bhp and the airbox another 10 to 15bhp, I am sure Joolz has a graph where were swapped the airbox back for the standard one as well to prove the new airbox working well, I`ll see if he can dig it out this week.
the best part was the drive back down south on saturday, until I hit the rain on the m42 and it just got worse from there on
Joolz is having some of these new airboxes made at the moment, not sure if they are to be carbon fibre or fibreglass, and he is definately the man to speak to for mapping any TVR, he can be found at ..... kitsandclassics@googlemail.com
he makes a good coffee as well
Well, I don't know the full history of this one, but I do know they did "play" with it a bit. I ran into someone who knew something about the history of my Sag and he said it was not a standard one. The person buying it had paid for the factory to "sort it out properly". That included engine and other work - although I don't have the full list of what they did.
Well looking at the torque numbers i'd suggest it's not a 4 litre for a start .. however unless we know who's dyno it was run on we can't deduce anything much, other than if you accept a sp6 is only capable of 80lb.ft/litre and scale your bhp numbers down accordingly then you get 371bhp which is about what a good tuscan S makes and entirely believeable for a tweaked Sagaris, which never makes Tuscan S numbers in std spec in my experience.
s5tvr said:
spitfire4v8 said:
an austec 387 would be about 345 on my dyno. as always though .. dynos vary 
My experience also comparing my results between Austec and SRR. However, the wheel figures were almost identical at, from memory, 278-280 bhp which on TDI's hub dyno came out at 311 bhp.
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