Dyno run - Very happy indeed!!
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- daxtojeiro
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Dyno run - Very happy indeed!!
Shame I set the limitter at 6000rpm, 50 rpm more and it would have hit 450BHP, very happy though!
Big thanks to Ray at V8Developments and Shaun from MS2Tuning.com
Engine is 5325cc RV8 (V8Developments) with 8psi of boost from a Rotrex C38-81 into a charge cooler. Fully Sequential injection / Ignition using one of my MS3 ECUs.
Big thanks to Ray at V8Developments and Shaun from MS2Tuning.com
Engine is 5325cc RV8 (V8Developments) with 8psi of boost from a Rotrex C38-81 into a charge cooler. Fully Sequential injection / Ignition using one of my MS3 ECUs.
Last edited by daxtojeiro on Sun Dec 15, 2013 9:25 am, edited 3 times in total.
http://www.extraefi.co.uk/cobra/accobra.htm SuperCharged 5325cc V8 Cobra Replica (Full sequential Fuel and Ignition MS3 management)
Hi Phil
I can't help thinking you could do with new valve springs, or a much heavier set if the ones you have are new. . . you seem to have quite a bit of valve bounce after 4500 revs. A very good figure though and probably quite a few more to come when you have the torque curve without the upsy downsy top end bit.
Best regards
Mike
I can't help thinking you could do with new valve springs, or a much heavier set if the ones you have are new. . . you seem to have quite a bit of valve bounce after 4500 revs. A very good figure though and probably quite a few more to come when you have the torque curve without the upsy downsy top end bit.
Best regards
Mike
poppet valves rule!
- daxtojeiro
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Hi Mike,
hadn't concidered that to be honest. It went rich on their lambda and lost a little around 5500, but my lambdas didnt pick it up and the fueling looked roughly the same on the datalogs, so I have no idea what happened there. The only thing I can think of is the water injection cut in, I havent set that up yet, but it got very hot (38C intake) so water came on and I guess messed it up a little.
I will have to look into the springs, they are the double spring type, but I dont know if they are new! Will see if Kent do them, as they supplied the cam and followers.
thanks
Phil
hadn't concidered that to be honest. It went rich on their lambda and lost a little around 5500, but my lambdas didnt pick it up and the fueling looked roughly the same on the datalogs, so I have no idea what happened there. The only thing I can think of is the water injection cut in, I havent set that up yet, but it got very hot (38C intake) so water came on and I guess messed it up a little.
I will have to look into the springs, they are the double spring type, but I dont know if they are new! Will see if Kent do them, as they supplied the cam and followers.
thanks
Phil
Last edited by daxtojeiro on Sat Dec 14, 2013 7:33 pm, edited 1 time in total.
http://www.extraefi.co.uk/cobra/accobra.htm SuperCharged 5325cc V8 Cobra Replica (Full sequential Fuel and Ignition MS3 management)
- daxtojeiro
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Cheers,
thats at 8psi of boost, could probably get away with going up to 12 and hit 500BHP but how reliable it would be is anyones guess. (8.9:1 cr)
To be honest its quicker than I can drive now!
Looking at the dyno run and the logs Shaun seems to think it could have been a miss fire, maybe oil, as my lambda picked up a lean spot at the same point theirs picked up a rich spot. Shaun seems to think if it was valve bounce it wouldnt have recovered like it did.
But I may get roller rockers sorted and new springs anyhow, something to do over winter.
Ive not seen it before whilst tuning it on the road, so Im not worried at the moment.
Phil
thats at 8psi of boost, could probably get away with going up to 12 and hit 500BHP but how reliable it would be is anyones guess. (8.9:1 cr)
To be honest its quicker than I can drive now!
Looking at the dyno run and the logs Shaun seems to think it could have been a miss fire, maybe oil, as my lambda picked up a lean spot at the same point theirs picked up a rich spot. Shaun seems to think if it was valve bounce it wouldnt have recovered like it did.
But I may get roller rockers sorted and new springs anyhow, something to do over winter.
Ive not seen it before whilst tuning it on the road, so Im not worried at the moment.
Phil
http://www.extraefi.co.uk/cobra/accobra.htm SuperCharged 5325cc V8 Cobra Replica (Full sequential Fuel and Ignition MS3 management)
- daxtojeiro
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Yeah, its plenty quick enough for me, would be nice to achieve 500BHP, but Im happy with it as it is, I fancy getting roller rockers next. Anyone know of a source for them?
thanks
Phil
thanks
Phil
http://www.extraefi.co.uk/cobra/accobra.htm SuperCharged 5325cc V8 Cobra Replica (Full sequential Fuel and Ignition MS3 management)
Nice one Phil,
was chatting to Shaun tonight while we were tweaking the cold start running on mine about yours,
was chatting to Shaun tonight while we were tweaking the cold start running on mine about yours,
Regards Tony C (COOPS)
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Procharger D1SC supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 416 RWHP, (boost leak)
Forged 4.8 V8 kitted out with the dogs Cajones of parts.
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Procharger D1SC supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 416 RWHP, (boost leak)
Forged 4.8 V8 kitted out with the dogs Cajones of parts.
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
- daxtojeiro
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Tony,
You need to get yours on the dyno, would be good to see what sort of power yours is giving, your running a lot more boost than I am too!
Phil
You need to get yours on the dyno, would be good to see what sort of power yours is giving, your running a lot more boost than I am too!
Phil
http://www.extraefi.co.uk/cobra/accobra.htm SuperCharged 5325cc V8 Cobra Replica (Full sequential Fuel and Ignition MS3 management)
Shaun and I have a few more tweaks to do first,
then it should be ready mate.
mines topping out at 5830rpm this is where the boost levels off and no more is being made,
But im happy its giving me 14psi
then it should be ready mate.
mines topping out at 5830rpm this is where the boost levels off and no more is being made,
But im happy its giving me 14psi
Regards Tony C (COOPS)
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Procharger D1SC supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 416 RWHP, (boost leak)
Forged 4.8 V8 kitted out with the dogs Cajones of parts.
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Procharger D1SC supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 416 RWHP, (boost leak)
Forged 4.8 V8 kitted out with the dogs Cajones of parts.
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
- Rossco
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Sounds like your heads are maxing out on flow there Tony. Your engine should be capable of 7k rpmCoops wrote:Shaun and I have a few more tweaks to do first,
then it should be ready mate.
mines topping out at 5830rpm this is where the boost levels off and no more is being made,
But im happy its giving me 14psi
It's the old debate about flow through a venturi. As the venturi (port) approaches its max flow you will see an increase in pressure but flow remains constant (or constant as near as makes no difference). While boost is good you still need to have sufficient air flow to feed the engine and what I suspect you're seeing is the heads not being able to flow enough air despite the boost, in fact it could be because of the amount of boost that your flow has dropped off.
It would be interesting to see if by reducing the pressure you moved the max flow point up the rev range and therefore released more power.
That might not be an issue for long cause according to another post some Merlins might come up for sale soon...Rossco wrote:
Sounds like your heads are maxing out on flow there Tony. Your engine should be capable of 7k rpm
.
Rossco wrote: It would be interesting to see if by reducing the pressure you moved the max flow point up the rev range and therefore released more power.
That's what I experienced on my 3.5 running 12 psi with the roots blower It just stopped after peak power as the blower was robbing to much horsepower for the engine.
Went back to 8 psi with slight more bhp and more rpm as a result.
'73 Ford Capri. 3.5 RV8, Magnacharger 110 Supercharger, Merlin F85 Heads, Water/Methanol Injected
'73 Ford F250, 6.7ltr V8
Building a GT40 mk2
'73 Ford F250, 6.7ltr V8
Building a GT40 mk2
- Rossco
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Dont want to hijack this thread but JP makes a good point about horsepower being soaked up by the blower.
I understand that changing boost on yours means sending the charger away for a pulley change. I've got a spare Vortech V3, the pulley is a simple thing to change. You wanna try the V3
Nice figures Phil
I understand that changing boost on yours means sending the charger away for a pulley change. I've got a spare Vortech V3, the pulley is a simple thing to change. You wanna try the V3
Nice figures Phil