what is the max power a std rst bottom end can take?
03-06-2005, 11:52 AM
#6
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I was told i would get 200 on std bottom end not low comp..would have to tun serious boosy tho and risk kaboom
only reason i see for really going low comp is that of det... unless you are using super dooper silly high octane fuel then det will occur once you bung loads of boost and lots of advance into a higer comp engine.
by going low comp it allows more ign advance to be used and also more boost...
It can cause off boost driveability problems as it will prob be noticibly laggier.
that what i understand of it anyway
I wait to be corrected
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03-06-2005, 11:55 AM
#9
With the correct headwork you can lower the compression on the standard bottom end.
Then you need to look at how you make the power, if you move it up the rev range then the bottom end will take more power as less torque is needed per bhp the more you rev it (subject to decent rod bolts etc of course!)
180 seems a reasonable amount to aim for though based on what ive seen others run, but dont expect an old engine wiht that much power to last for long if driven hard!
Then you need to look at how you make the power, if you move it up the rev range then the bottom end will take more power as less torque is needed per bhp the more you rev it (subject to decent rod bolts etc of course!)
180 seems a reasonable amount to aim for though based on what ive seen others run, but dont expect an old engine wiht that much power to last for long if driven hard!
03-06-2005, 11:56 AM
#10
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My 1st engine Ahmed chip with 16psi(the 1 that was in car when bought) came with 179bhp (PTS figs)
I had a Piper T2 added and a GRS EVO3 inter fitted & set up and power was 155@wheels(AVA). It was driven hard & it eventualy let go.
To answer your question I'd say 155@wheels........175bhp (ish, fly) would be the figure id put on it!
HTH
I had a Piper T2 added and a GRS EVO3 inter fitted & set up and power was 155@wheels(AVA). It was driven hard & it eventualy let go.
To answer your question I'd say 155@wheels........175bhp (ish, fly) would be the figure id put on it!
HTH
03-06-2005, 12:13 PM
#14
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They can take a lot. Det is what kills them, and running lean. Ive got 3 engines running around with 200hp, and they are used hard - one has done 175k, another 130k... High mileage engines tend not to go.
I would be happy running 220bhp daily no probs.
I would be happy running 220bhp daily no probs.
03-06-2005, 12:16 PM
#15
just finding my feet
oranoco is running 250bhp on standard rods and crank, has uprated pistons, but thats about it. We are all waiting from him to put a rod though the block
hes headgasket is the major issue with that engine rather than boost as hes also got a tiny turbo on it and runs out of boost top end causeing less stress on the rods but more on the headgasket and gearbox,,,,,,,,,,,,,,,,,,, what parts has he fooked the most ?
also based on that a fresh standard bottom end will take 18psi on a standard turbo but with headwork and cams will require a larger turbo as theres not gonna be enough air proccesed to fill and in turb will be a slower engine or the turbo wil die before anything else
03-06-2005, 01:02 PM
#16
Originally Posted by chip-3door
Originally Posted by K3V HA
Dan, if you read magazines such as Fast Ford or alike, im sure theyll have the info in there!!! 
03-06-2005, 01:04 PM
#17
My old rst ran std ish up to about 75k
a bad ahmed conversion and 17psi ran that for a while
about 90k turned up at ava had it setup to 165 wheels
about 95k or something turned back up at ava and had a fuel mod up to 195 wheels
Car ran a max of 206 at wheels once but was turned back down.
ran to about 155k when a valve head dropped from Karls analysis.
Bottom end completely std.
195 wheels equals about 220 horsepower?
RW
a bad ahmed conversion and 17psi ran that for a while
about 90k turned up at ava had it setup to 165 wheels
about 95k or something turned back up at ava and had a fuel mod up to 195 wheels
Car ran a max of 206 at wheels once but was turned back down.
ran to about 155k when a valve head dropped from Karls analysis.
Bottom end completely std.
195 wheels equals about 220 horsepower?
RW
03-06-2005, 01:30 PM
#22
on my old engine, (standard bottom end) which cost me 250 quid it ran 193 flywheel..
its hard to put an exact figure on it mate, as I assume there are a few variables..!?
Is it a readers question lol?? if so, just reply.. Whack the boost up and find out
i would say its more like 220 ish max.. but have not tested so cant be a definate answer
it ran 193 flywheel.. its hard to put an exact figure on it mate, as I assume there are a few variables..!?
Is it a readers question lol?? if so, just reply.. Whack the boost up and find out
i would say its more like 220 ish max.. but have not tested so cant be a definate answer
03-06-2005, 01:36 PM
#23
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Mines done 109k miles. Runs completely standard bottom end and at 17psi made 258bhp, midrange torque was crap but peaked at 226lb/ft. It does get run on decent fuel and oil/filter etc changed regularly, but it has had the absolute shit battered out of it over the last few months and it doesn't smoke, rattle knock etc
There were a few posts about it on here last month
There were a few posts about it on here last month
Nice one 
03-06-2005, 01:46 PM
#29
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258bhp! 
I was chatting to my bro about this (he runs a mk2 fessa with a s2 lump in it) he seems to think that with the correct fueling you can get a fairly reliable 200bhp out of a standard bottom end. But as said above, any probs will definately surface when your running 70bhp more than the engine was as standard from the factory.
The best thing really, is to be prepared for the worst but expect the best. IE tune her up, but be prepared for that rebuild if she blows
I was chatting to my bro about this (he runs a mk2 fessa with a s2 lump in it) he seems to think that with the correct fueling you can get a fairly reliable 200bhp out of a standard bottom end. But as said above, any probs will definately surface when your running 70bhp more than the engine was as standard from the factory.
The best thing really, is to be prepared for the worst but expect the best. IE tune her up, but be prepared for that rebuild if she blows
03-06-2005, 01:52 PM
#30
just finding my feet
its not about how much boost you run
very ver true, its the amount of air the car consumes but ya cant mneasure flow acuratly so ya measure presure, hence why i said what turbo
a ported head done well and decent cams will consume more air than standard and make it feel laggy but power at the top when the airs filling the engine
so if hes using a big turbo or got a well flowed head and cams he might be over speeding the turbo to a fooker to make the power at 17psi
or a leak in the boost pipe
03-06-2005, 01:58 PM
#34
:cry : at 17psi making 258, if that is true then there must be a lot that you arent telling us about the engine!
b19bal does this
Really make sense to you, cause if so i think you need to learn a bit more yet!
Ported head means lower gas speed so LESS intake of air off boost, and cams well im not even going to try and explain that in a post but critical things are stuff like lift on overlap.
b19bal does this
a ported head done well and decent cams will consume more air than standard and make it feel laggy but power at the top when the airs filling the engine
Ported head means lower gas speed so LESS intake of air off boost, and cams well im not even going to try and explain that in a post but critical things are stuff like lift on overlap.
03-06-2005, 01:59 PM
#36
just finding my feet
westy think about what ya saying !!!!
17psi is presure !!!!, so if the heads ported really reallywell then 17psi would be more than 17psi on a non ported head, meaning the turbo is working harder
a larger turbo flows more air anyway so getting 17psi wont require the same spinning rpm as a smaller turbo
hence why a hybrid is a nicer idea than standard as its designed to work harder for flowed heads
17psi is presure !!!!, so if the heads ported really reallywell then 17psi would be more than 17psi on a non ported head, meaning the turbo is working harder
a larger turbo flows more air anyway so getting 17psi wont require the same spinning rpm as a smaller turbo
hence why a hybrid is a nicer idea than standard as its designed to work harder for flowed heads
03-06-2005, 02:01 PM
#38
Originally Posted by Westy
so if hes using a big turbo or got a well flowed head and cams he might be over speeding the turbo to a fooker to make the power at 17psi