3.7 Speed Six Engine Designed and Engineered by RND
Discussion
Mickywoosh said:
Well done Don - they look like some fairly healthy numbers which is good news.
I drove mine back from Devon last week in preparation for a Le Mans trip, and the new engine, like yours, is running very smoothly on OMEX - too smooth in fact - I'm getting some overrun crackles dialled back into the map to retain the full TVR character!!.
We still have some final power runs to undertake to map the top-end but initial readings show a peak torque of 335 Ib/ft. I think I'm going to have to revert to your higher capacity exhaust configuration to achieve maximum BHP figures though - I understand that the 4.0 Speed Sixes had a larger bore exhaust so given the capacity increase, I think this will be necessary to see the best out of the engine.
Good luck with the Cerb. I had a look at yours when I picked mine up and the new owner should be well pleased.
Hi MickyI drove mine back from Devon last week in preparation for a Le Mans trip, and the new engine, like yours, is running very smoothly on OMEX - too smooth in fact - I'm getting some overrun crackles dialled back into the map to retain the full TVR character!!.
We still have some final power runs to undertake to map the top-end but initial readings show a peak torque of 335 Ib/ft. I think I'm going to have to revert to your higher capacity exhaust configuration to achieve maximum BHP figures though - I understand that the 4.0 Speed Sixes had a larger bore exhaust so given the capacity increase, I think this will be necessary to see the best out of the engine.
Good luck with the Cerb. I had a look at yours when I picked mine up and the new owner should be well pleased.
I am pleased that you are happy with your engine rebuild, I understand what you mean about missing the crackles and pops, it would be nice to have a switch for an alternative map so you can dial them back in on request. It would be a good idea to get your exhaust modded to the same state as mine it did make a big difference. Look out for my T 350 at Le Mans as the new owner is taking it there. I did see your T 350 at Power Crazy, I must admit it is a lovely clean well presented example.
Good luck
Don
donski said:
I am pleased that you are happy with your engine rebuild, I understand what you mean about missing the crackles and pops, it would be nice to have a switch for an alternative map so you can dial them back in on request.
Like the cars with the Syvecs ECU have, you mean? 
Normal map until entering to the tunnel, then "pops & bangs" map in the tunnel:
http://youtu.be/t0uzHiNYnds
Edited by JonRB on Tuesday 3rd June 23:06
I must admit that is taking pops and bangs to the extreme - more like a D-day reenactment! Awesome for occasional tunnels.
Syvecs does look very good but it is comes at a high cost - when I last looked it was just over £1k for Omex where Syvecs is something over £3k I think whilst not offering any huge benefits. Do like the switchable map though - must ask Omex if they can do that.
Syvecs does look very good but it is comes at a high cost - when I last looked it was just over £1k for Omex where Syvecs is something over £3k I think whilst not offering any huge benefits. Do like the switchable map though - must ask Omex if they can do that.
Mickywoosh said:
I must admit that is taking pops and bangs to the extreme - more like a D-day reenactment! Awesome for occasional tunnels.
LOL yes. I agree - it is rather too much. 
Syvecs supports up to 8 different maps, so I have a couple of spares right now. At some stage I'd like to have a much less extreme 'pops & bangs' map added that just gives some nice crackles and pops rather than the full on artillery of that one.
donski said:
Just in time for my T350's new owner to enjoy the power and flexibility of the new engine which has performed faultlessy and so much smoother with the Omex ECU.
Now for the next project Chimaera here I come, good luck you Speed 6 boys I am heading back to the V8's.
Don
That is an excellent result. Long may the good news continue from RND.Now for the next project Chimaera here I come, good luck you Speed 6 boys I am heading back to the V8's.
Don
donski said:
Just in time for my T350's new owner to enjoy the power and flexibility of the new engine which has performed faultlessy and so much smoother with the Omex ECU.
Now for the next project Chimaera here I come, good luck you Speed 6 boys I am heading back to the V8's.
Don
Do you think those figures are good ? At the fly and the torque curve is no very good .... SorryNow for the next project Chimaera here I come, good luck you Speed 6 boys I am heading back to the V8's.
Don
glow worm said:
Do you think those figures are good ? At the fly and the torque curve is no very good .... Sorry
Looks about right for a 3.7 to me. It's never going to be as good as a 4+Besides, Rolling Road plots are only good for comparisons like-for-like on the same day. They're not consistent enough to give absolute values.
Edited by JonRB on Wednesday 4th June 20:53
Not wishing to appear a numpty glow worm but could you expand on your comment. These numbers always seem to turn into a bun fight and I'm genuinely interested to understand.
A standard 3.6 makes in truth I believe, 330ish bhp at the fly so an improvement to 388 would seem a significant improvement - 20% approximately for the same capacity. In terms of torque, my old 3.6 'took off' significantly at about 4500 rpm right through to the red line. This 3.7 seems to up the ante at roughly the same rpm and the torque curve is flat thereafter, which I always understood to be a good thing?
A standard 3.6 makes in truth I believe, 330ish bhp at the fly so an improvement to 388 would seem a significant improvement - 20% approximately for the same capacity. In terms of torque, my old 3.6 'took off' significantly at about 4500 rpm right through to the red line. This 3.7 seems to up the ante at roughly the same rpm and the torque curve is flat thereafter, which I always understood to be a good thing?
glow worm said:
Must be me ... I don't know how much the upgrade costs... But I just prefer the torque coming in across the rev range and being flatter and I don't rev an engine to 7000 ... I'll stick with my 4.5 .
you can get 2x of those 3.7 with omex for the price of your 4.5 ... I don't know how much the upgrade costs... But I just prefer the torque coming in across the rev range and being flatter and I don't rev an engine to 7000 ... I'll stick with my 4.5 .
as for the figures seem to be quite good when taking a look at my holy
grail 4.3 upgrade standard with just decat fly figures.
if i would have the choice again would def. go the 3.7 route and squeeze
out as much as possible. of course 4.3 more torque more bhp but different
feel of car and engine. if i want to have laid back driving i ll take the chimaera out
so for my cup of tea the 3.7 would be the way to go....
gacksen said:
as for the figures seem to be quite good when taking a look at my holy
grail 4.3 upgrade standard with just decat fly figures.
I reckon that the Holy Grail would be everything Racing Green have to offer - FFF2 head, Simplex Timing Chain, Syvecs, decat, and Variable Valve Timing (when it becomes available) - and a 4.3L block. grail 4.3 upgrade standard with just decat fly figures.
Gassing Station | Speed Six Engine | Top of Page | What's New | My Stuff