andy10v Posted December 2, 2015 Share Posted December 2, 2015 What limits RPM on a DE? Quote Link to comment Share on other sites More sharing options...
fake ben taylor Posted December 2, 2015 Share Posted December 2, 2015 Rods and rod bolts is the usually what limits rpm on engines. Im under the impression the de rods aren't great? Quote Link to comment Share on other sites More sharing options...
Mark@Abbey m/s Posted December 2, 2015 Share Posted December 2, 2015 (edited) Limiting factor in DE rev wise is valve Spring retainers and collets. Seen failures at 7100/7200rpm when used on track. Spring retainers are alloy in stock form. Stock rods will go to 7500rpm no troubles in NA trim. High RPM will cause oiling issues as well. Edited December 2, 2015 by Mark@Abbey m/s Quote Link to comment Share on other sites More sharing options...
fake ben taylor Posted December 2, 2015 Share Posted December 2, 2015 (edited) Ooh that's good to know I think the jwt springs come with new retainers.... Edited December 2, 2015 by fake ben taylor Quote Link to comment Share on other sites More sharing options...
andy10v Posted December 2, 2015 Share Posted December 2, 2015 Good info thanks. Is a revup oil pump a good upgrade in that case if you were fitting cams/springs/retainers? Quote Link to comment Share on other sites More sharing options...
fake ben taylor Posted December 2, 2015 Share Posted December 2, 2015 I did read something that said the revup oil pump was an upgrade, but unsure atm how true that was. There is a nismo pump which uses gtr internals but it's ££££ Quote Link to comment Share on other sites More sharing options...
fake ben taylor Posted December 3, 2015 Share Posted December 3, 2015 I want my car to idle like this <3 <3 2 Quote Link to comment Share on other sites More sharing options...
Mark@Abbey m/s Posted December 3, 2015 Share Posted December 3, 2015 rev up is just a better quality pump gear materials no different in flow. Nismo has increased flow over stock DE/REV UP oil pump. I will check a DE for a VAC at full throttle when I next get one on the dyno for a retune. thanks Quote Link to comment Share on other sites More sharing options...
docwra Posted December 3, 2015 Share Posted December 3, 2015 Kind of funny that this all started with it being relatively cheap to gain N/A power from the DE...but now the cost is not so much an issue. Constructive. See post #100, I reckon youre looking at a fair bit less than an SC install (even including the headers) and youre going to have better throttle response and potentially a greater area under the curve as well. Also bear in mind the exhaust, injectors and management would be needed if you went FI anyway. Cheers for input from Mark as well, good to see not everyone writes NA tuning off as a non starter. The point is that its probably time to reconsider this standard "no point tuning without FI" answer, Im personally very interested to see where Ben finishes up as theres some promise here and being Northern hes tight as, so costs wont be too high either Quote Link to comment Share on other sites More sharing options...
nissanman312 Posted December 3, 2015 Share Posted December 3, 2015 It is, really. You can lose double figure KG changing the exhaust alone, then there's the ton of sound deadening, the weight in the rear hatch, lighter wheels if you're not on Rays... And if your fat go on a diet lol 1 Quote Link to comment Share on other sites More sharing options...
DAN@ADRIAN FLUX Posted December 3, 2015 Share Posted December 3, 2015 If anyone needs help with insurance in regards to exhaust modifications, please feel free to drop me a line. Kind Regards Dan Quote Link to comment Share on other sites More sharing options...
Jetpilot Posted December 3, 2015 Share Posted December 3, 2015 I want my car to idle like this https://www.instagra...m/p/-zJpkYFdOR/ <3 <3 Reminds me of a bridgeport rotary Quote Link to comment Share on other sites More sharing options...
jimjam92 Posted December 3, 2015 Author Share Posted December 3, 2015 OK guys thank you all for your input, think this more than answers my original question . Don't think I will be looking to build an NA monster anytime soon. Just bolt-ons and a remap. Who knows later down the line I might be tempted to go FI but think I would more likely go down the Supra/Skyline route for this. Not looking to break new ground and am quite happy to go down the tried and tested route to build the car that appeals to me. Cheers 1 Quote Link to comment Share on other sites More sharing options...
Bodyboarder81 Posted December 3, 2015 Share Posted December 3, 2015 Say what .... You just want bolt on's and then if you want big power you might consider FI .... I've heard with some kind of header you can net 350 whp !! Hahaha Ya just stick to the usual mate .... Both crazy n/a and FI are for the stupid/ insane Quote Link to comment Share on other sites More sharing options...
fake ben taylor Posted December 3, 2015 Share Posted December 3, 2015 rev up is just a better quality pump gear materials no different in flow. Nismo has increased flow over stock DE/REV UP oil pump. I will check a DE for a VAC at full throttle when I next get one on the dyno for a retune. thanks That would be good thanks! Quote Link to comment Share on other sites More sharing options...
fake ben taylor Posted December 3, 2015 Share Posted December 3, 2015 I want my car to idle like this https://www.instagra...m/p/-zJpkYFdOR/ <3 <3 Reminds me of a bridgeport rotary One day I'll own a bridge port. But need a lottery win to cope with the unreliability and running costs of a rotary lol The z I linked is Michael Gardner who's running Sasha's old de with c10/c9 cam combo sadly this combo is for track o ly as you lose low rev driveability without itbs Quote Link to comment Share on other sites More sharing options...
Rock_Steady Posted December 3, 2015 Share Posted December 3, 2015 I've forgotten, is the Nismo manifold worth it or not? 1 Quote Link to comment Share on other sites More sharing options...
fake ben taylor Posted December 3, 2015 Share Posted December 3, 2015 No Quote Link to comment Share on other sites More sharing options...
Jetpilot Posted December 3, 2015 Share Posted December 3, 2015 (edited) My last rotary on a streetport made anywhere from 450bhp - 501bhp for 20k+ miles from day one on a rebuild until it sh*t a waterseal, if i wanted to get it rebuild (drive in/drive out) it would have cost the same as your looking to spend on headers and cams or there abouts. Sure there is extra work in machining for a bridge but once its done its no different Just as i left the rotary circles people were starting to play with peripheral ports or semi peripheral in the quest for more power. Edited December 3, 2015 by Jetpilot Quote Link to comment Share on other sites More sharing options...
jimjam92 Posted December 3, 2015 Author Share Posted December 3, 2015 I've forgotten, is the Nismo manifold worth it or not? No Haha Quote Link to comment Share on other sites More sharing options...
fake ben taylor Posted December 3, 2015 Share Posted December 3, 2015 My last rotary on a streetport made anywhere from 450bhp - 501bhp for 20k+ miles from day one on a rebuild until it sh*t a waterseal, if i wanted to get it rebuild (drive in/drive out) it would have cost the same as your looking to spend on headers and cams or there abouts. Sure there is extra work in machining for a bridge but once its done its no different Just as i left the rotary circles people were starting to play with peripheral ports or semi peripheral in the quest for more power. That's awesome!! I do like fd's and the prices seem good atm but good clean ones seem few and far between without importing Quote Link to comment Share on other sites More sharing options...
Jetpilot Posted December 3, 2015 Share Posted December 3, 2015 Yep, imho a car that should be on everyones list, awesome drive and they way they make power is epic. The only moving part is the rotor, no valves, cams etc, they rev so quick its like a bike engine. Quote Link to comment Share on other sites More sharing options...
Mark@Abbey m/s Posted December 7, 2015 Share Posted December 7, 2015 (edited) The world is doing it.... Just not the UK. Don't want revup cams for the 340, need some very wild ones, like jwt c8 and above. But thank you all for highlighting why no one on this forum tunes na. Rather than approach it with 'interesting, no one here has managed that yet' you ridicule and shout it down. The 'specialists' in the UK haven't really tried the right mods in the UK yet to get power. Sorry but to fit cams into a 350Z motor is a lot of money , easier to do with the motor out in our opinion; Then if your running wild cams you need to run more compression as the static compression will be dropped as the cam is wilder; new pistons needed; I know Sasha when he was running his own company used to tune on a Dynapack. Used to throw idea between us. They used to use SAE conversion which will add around 10/15bhp to a bhp figure; Your end up with a motor with a engine with a 2000rpm power band max that will not be nice to drive at small throttle openings and low RPM's , will require rev to make it go properly; That's why us UK tuners always say go FI makes a more fun car easier to drive quickly on the road , but if the car is going to be a track car/race car yeah go for NA power but your also need a sequential gearbox to make the most of the narrow power band. I did manage to run a car on our in house dyno today and recorded Vac in the plenum , reading in Absolute KPA we saw a increase in Vac from 0 to approx 0.003 kpa at the rev limit such a small increase , my thought is it the TB or the plenum design; Same car recorded 270hub bhp thou pretty good number for a DE motor , circ approx 310 flywheel bhp , stock motor , headers, ART decat pipes, plenum spacer,stock airbox with velocity stack, Milltek system and a very good reamp with UPREV. a Stock DE will give around 235/240 hub bhp we have seen from all the cars we have run over the years. Edited December 8, 2015 by Mark@Abbey m/s 2 Quote Link to comment Share on other sites More sharing options...
andy10v Posted December 7, 2015 Share Posted December 7, 2015 Same car recorded 270hub bhp thou pretty good number for a DE motor , circ approx 310 flywheel bhp , stock motor , headers, ART decat pipes, plenum spacer,stock airbox with velocity stack, Milltek system and a very good reamp with UPREV. a Stock DE will give around 235/240 hub bhp we have seen from all the cars we have run over the years. Ignoring cam install costs, would a set of "stage one" cams, eg Nismo R-Tune, Tomei PonCam, JWT S1 give a significant improvement on the above car? Quote Link to comment Share on other sites More sharing options...
Mark@Abbey m/s Posted December 8, 2015 Share Posted December 8, 2015 I think you may see around a gain of 10bhp though out the rev range; Limiting factory will be rev limit , these cams will make the car want to rev on and the stock Alloy valve caps wont allow more than 7100rpm we feel. Quote Link to comment Share on other sites More sharing options...
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