called an average tune
Team Launch Holset Power Project
- Thread starter diamondsink
- Start date
called an average tune
Stavros
Active Member
To be fair, I'd much rather have boost peaking high then dropping off, than what most used to do, which was be under the belief that boost spikes were bad and they wanted a flat boost curve.
This obsession with no spikes and flat boost accross the board is why you see so many torqueless (in comparison to this) cars.
In comparison to most 330bhp cars this will feel like a rocketship due to the torque, and with a decent downpipe the boost would come in sooner and the power and torque would hold for plenty longer.
Regarding it blowing hot air with much more boost, well, the turbo should be good for 450, the turbo is efficient to about 3bar boost, so I bet it is barely getting in to its stride tbh.
Would need to get a charge temp gauge on it, pre-intercooler, and find out the facts.
375lbft at 1.3bar is still nuts regardless, 450+ torque at proper boost, looks like it will always give more torque than power, and not many 2litre turbo cars can do that.
Can only presume this is 'cause of how efficent/flashy the Holset compressors are compared to most the turbos we all used to using.
IF you was reaching the worthwhile boost limit of the 30 on an SR (id be amazed if that was the case TBH), I can think of 3 other Holsets that may be more suitable, though one is smaller but seen it do over 450 on a 1.8.
This obsession with no spikes and flat boost accross the board is why you see so many torqueless (in comparison to this) cars.
In comparison to most 330bhp cars this will feel like a rocketship due to the torque, and with a decent downpipe the boost would come in sooner and the power and torque would hold for plenty longer.
Regarding it blowing hot air with much more boost, well, the turbo should be good for 450, the turbo is efficient to about 3bar boost, so I bet it is barely getting in to its stride tbh.
Would need to get a charge temp gauge on it, pre-intercooler, and find out the facts.
375lbft at 1.3bar is still nuts regardless, 450+ torque at proper boost, looks like it will always give more torque than power, and not many 2litre turbo cars can do that.
Can only presume this is 'cause of how efficent/flashy the Holset compressors are compared to most the turbos we all used to using.
IF you was reaching the worthwhile boost limit of the 30 on an SR (id be amazed if that was the case TBH), I can think of 3 other Holsets that may be more suitable, though one is smaller but seen it do over 450 on a 1.8.
finally a graph from a holset turbo on a SR.... without the lag
to greg.
what was your finally engine spec without looking through the whole project dude?
Totaly stock black top sr
Fmic
Oil cooler
Ali rad
Custum elbow
Frankinstine exhaust (all sorts of bits chopped up and put together)
Walbro pump
Fse fpr
Nismo 740 injectors
Nistune ecu
Z32 maf
eBay air filter
Greedy profec b boost control
Tail 38mm wastegate
800bhp.com manifold
Gsracing hx30 with custom oil feed and return
375lbs of torque at whatever rpm it´s making it could be used at higher rpm as pistons and rods are cylinder pressure / torque limited.
so in effect the setup is less efficient because the potential torque holding ability of the engine is not used , or the turbo used to it´s own ability.
So if we assume some loss of torque , say down to 340lbs@7k
that´s 453hp this engine COULD be making without any added stress.
Now to me not using the engines abilities sounds kinds stupid when you do it at lower rpm and not higher rpm when it makes even more sense to do so.
This is what I see time and time again, people are making plenty of torque but aren´t using it where it makes the most difference to performance .
Up high.
That´s giving up FREE HP!!
And I can´t approve of such nonsense
captain_chaos
Member
I like that statement but seriously, damm that motor is a beast considering it's a 2ltr.
Very enjoyed reading this thread so far. Very interested on the figures with the other car.
And I think I definatly made my mind up about what blower is getting strapped to my 2.5 =] just need the pennies saved up.
Good work guys, keep up the crazy work
diamondsink
Kyouto Drift
Went in Ben's car yesterday, the power delivery is very nice. A solid pull. He had a few issue with wastegate bolts coming loose. But some more bracing will solve this.
As for my engine build heres the complete spec list
CP 86.5mm 8.5:1 pistons, Rings & pins
Apex H beam Rods with ARP cap bolts
Cometic 1.6mm HG
ARP Head Studs
New Nissan oil pump
Nissan Water Pump
Full Nissan Gasket set
Apex Crank alu pulley
Block bored and honed
Head skimmed
Crank reground
ACL Race mains and Big end bearings
ACL Thrust washers
Apex Timing Chain Kit
Valves lapped and shimmed.
Has cost me way more than i had planned but it will be a strong fresh engine for when i get the HX35 on there. With a RB box i could get the boost up and hope for around a 500hp figure with cams. The standard intake manifold will also become an issue too. But for now i will stick to around 400 to save the sr box.
That reminds me a need a new clutch too!
As for my engine build heres the complete spec list
CP 86.5mm 8.5:1 pistons, Rings & pins
Apex H beam Rods with ARP cap bolts
Cometic 1.6mm HG
ARP Head Studs
New Nissan oil pump
Nissan Water Pump
Full Nissan Gasket set
Apex Crank alu pulley
Block bored and honed
Head skimmed
Crank reground
ACL Race mains and Big end bearings
ACL Thrust washers
Apex Timing Chain Kit
Valves lapped and shimmed.
Has cost me way more than i had planned but it will be a strong fresh engine for when i get the HX35 on there. With a RB box i could get the boost up and hope for around a 500hp figure with cams. The standard intake manifold will also become an issue too. But for now i will stick to around 400 to save the sr box.
That reminds me a need a new clutch too!
diamondsink
Kyouto Drift
Found this little clip of my version of discreet 'power sliding' at Trax you can hear the screamer pipe barking too
YouTube - LaunchMotorsport Drifting around Silverstone
I dont think anybody would have even noticed the smoke
diamondsink
Kyouto Drift
An update on the engine build. Its taken far longer than i wanted but its almost done.
Reground Crank, ACL race bearings and ladder.
CP pistons and apex rods
Fitted, (small ends needed honing to fit the pins perfectly)
Piston and rods fitted to the block
Pick up fitted
Head on with arp bolts and cometic gasket. Shit me they have to be tight.
Reground Crank, ACL race bearings and ladder.
CP pistons and apex rods
Fitted, (small ends needed honing to fit the pins perfectly)
Piston and rods fitted to the block
Pick up fitted
Head on with arp bolts and cometic gasket. Shit me they have to be tight.
little_ant
Member
out of interest how much difference is there in price between an Apex timing chain and a proper nissan one? as i have heard bad things about the apex ones being a bit weaker and more prone to snapping than the genuine nissan ones.
diamondsink
Kyouto Drift
I used the Nissan one in the end. The apex one is going back, it looks weaker and not that good.
The bearings are .25 oversize, yes I know about the hardnened issue.
The bearings are .25 oversize, yes I know about the hardnened issue.
diamondsink
Kyouto Drift
It was checked by the engine shop and was said to be fine. He knew i was going to be using a Metal gasket.
A few more random pics-
The chain seems to go slack in between stokes. The inlet pulley flicks round on the end of the revolution and pulls the tension in a bit causing the slack. The tensioner is installed correctly and ratcheted out, i putting it down to the tensioner having no oil pressure?
Engine went back in tonight, just the manifolds and plumbing up to do until the big start up. Got to get the oil pressure up before. I'v back filled the pump from the filter housing so fingers crossed it primes ok.
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m.d.
Active Member
really interesting builds there, i still want to go holset eventually and this is definitely helping my decide,
just a quick one about the 2.5 inch down pipe, i very very much doubt that is restricting the power at all. especially as you have an external gate too.
ive been running a t04e ebay turbo on a 2.5 inch down pipe for a few years now at over 400bhp on a baby 2.0 RB20. and the car was well on the way to making more power with more boost but i was getting surge from the turbo and my injectors were too small.
just a quick one about the 2.5 inch down pipe, i very very much doubt that is restricting the power at all. especially as you have an external gate too.
ive been running a t04e ebay turbo on a 2.5 inch down pipe for a few years now at over 400bhp on a baby 2.0 RB20. and the car was well on the way to making more power with more boost but i was getting surge from the turbo and my injectors were too small.
diamondsink
Kyouto Drift
Ben is only going on what greg told him. His exhaust is a frankistein of pipes and welding. A proper free flowing system is a step in the right direction.