Worzey
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| posted on 28/3/13 at 03:20 PM |
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Dyno results :)
Just heard back from RAW on the dyno results for my car now that the Rotrex Supercharger has been fitted.
It made 260bhp on the rollers :-)
Its running a 4AGE 20v silvertop with a standard bottom end, fast road cams and flowed head. The power generated was much bigger than anyone
expected.
They've never run a 4AGE with a standard bottom end above 225bhp and hence are concerned what impact 260 would have on engine longevity.
On RAW's advice we've reduced the boost so it makes a comfortable 240bhp. The rev limiter has also been reduced to 7,500rpm as an added
safety factor. That still gives it 420bhp/tonne 
I have the option of fitting forged pistons and rods in future (without needing to lower compression) to get the full fat 260 without having to buy a
bigger supercharger for increased boost.
Looking forward to the weather improving now
Caterham R400
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40inches
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| posted on 28/3/13 at 03:29 PM |
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Have you seen this web site? Club4AG
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bi22le
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| posted on 28/3/13 at 05:04 PM |
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I expected more 
Good times, now time to get out and use it in anger. By the way, using 4AGZE rods and pistons will strenthen the bottom end but also lower the CR.
Maybe a cheaper alturnative to the £1K pistons and rods.
I bet it sounds good too. Any videos?
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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laptoprob
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| posted on 28/3/13 at 05:04 PM |
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quote:
Originally posted by Worzey
Just heard back from RAW on the dyno results for my car now that the Rotrex Supercharger has been fitted.
It made 260bhp on the rollers :-)
Its running a 4AGE 20v silvertop with a standard bottom end, fast road cams and flowed head. The power generated was much bigger than anyone
expected.
They've never run a 4AGE with a standard bottom end above 225bhp and hence are concerned what impact 260 would have on engine longevity.
On RAW's advice we've reduced the boost so it makes a comfortable 240bhp. The rev limiter has also been reduced to 7,500rpm as an added
safety factor. That still gives it 420bhp/tonne
I have the option of fitting forged pistons and rods in future (without needing to lower compression) to get the full fat 260 without having to buy a
bigger supercharger for increased boost.
Looking forward to the weather improving now
Congrats on the figures, should make for a lively car
What compresion ar you running now?
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Worzey
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| posted on 28/3/13 at 05:17 PM |
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The bottom end is bog standard so the compression is unchanged at 10.5:1 (or so I believe).
I've been advised not to change the compression ratio. RAW can supply forged pistons that will run at this compression and allow me to unlock
the full 260bhp if I decided to go down that route next year.
240bhp will be more than enough for the moment.
Caterham R400
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Bare
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| posted on 28/3/13 at 05:23 PM |
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Brand and Type/design of Dyno?
Cheap ones traditionally read 20% higher than reality.
Most shops have the cheap ones as competent ones cost multiples More $ .
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Worzey
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| posted on 28/3/13 at 05:36 PM |
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I don't know what dyno it was. It was taken by RAW on my behalf as they've been building the engine for me. I have no reason to suspect
the figures are incorrect. Anyone know who RAW use, I guess its in the Hereford/Cheltenham area?
Given how much it cost I hope it was a good one!
Caterham R400
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six mad
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| posted on 28/3/13 at 06:06 PM |
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Great Results you will enjoy that
Do you have a graph? whats the torque like?
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Worzey
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| posted on 28/3/13 at 06:15 PM |
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I've not seen the graph yet but will post as soon as I do. With the SC the torque should be much higher and more linear than before.
Caterham R400
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laptoprob
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| posted on 28/3/13 at 06:50 PM |
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quote:
Originally posted by Worzey
The bottom end is bog standard so the compression is unchanged at 10.5:1 (or so I believe).
I've been advised not to change the compression ratio. RAW can supply forged pistons that will run at this compression and allow me to unlock
the full 260bhp if I decided to go down that route next year.
240bhp will be more than enough for the moment.
Music to my ears
Im currently having a bog standard XE(10.5:1) engine put together along with a Rotrex C30-73.
I reckon your figures are about bang on with the couple of mods youve done.
Which Rotrex do you have?
[Edited on 28/3/13 by laptoprob]
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Worzey
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| posted on 28/3/13 at 07:09 PM |
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I believe its a Rotrex C30-74.
I'll get some pics, graphs and video's up when I collect the car in a few weeks time
Caterham R400
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laptoprob
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| posted on 28/3/13 at 07:14 PM |
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quote:
Originally posted by Worzey
I believe its a Rotrex C30-74.
I'll get some pics, graphs and video's up when I collect the car in a few weeks time
My mistake, thats the same as mine
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TimC
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| posted on 28/3/13 at 08:10 PM |
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Just FYI, should a doctor unexpectedly appear at my door and tell me that I have a short period to live I am going to drive to nearby RAW and steal
your car.
That is going to be berzerk. Enjoy.
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sdh2903
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| posted on 28/3/13 at 08:16 PM |
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quote:
Originally posted by Bare
Brand and Type/design of Dyno?
Cheap ones traditionally read 20% higher than reality.
Most shops have the cheap ones as competent ones cost multiples More $ .
Do you ever have anything constructive or useful to say?
Car sounds like it will be fun look forward to seeing some pics.
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mark chandler
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| posted on 28/3/13 at 09:23 PM |
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quote:
Originally posted by sdh2903
quote:
Originally posted by Bare
Brand and Type/design of Dyno?
Cheap ones traditionally read 20% higher than reality.
Most shops have the cheap ones as competent ones cost multiples More $ .
Do you ever have anything constructive or useful to say?
Car sounds like it will be fun look forward to seeing some pics.
Apart from when he is boasting about what he has done its the standard negative drivel 
Forced induction is the way forward
[Edited on 28/3/13 by mark chandler]
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BaileyPerformance
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| posted on 28/3/13 at 11:00 PM |
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Bloody good engines, we mapped a stock one (other then jenveys and Omex) ages ago, made loads of power and rev'd for ever. No surprise it made
good power when supercharged.
You have been advised correctly, do not reduce the CR, with careful mapping high CR is not a problem with forced induction.
www.baileyperformance.co.uk
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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wylliezx9r
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| posted on 28/3/13 at 11:16 PM |
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quote:
Originally posted by Bare
Brand and Type/design of Dyno?
Cheap ones traditionally read 20% higher than reality.
Most shops have the cheap ones as competent ones cost multiples More $ .
TROLL ^
I spent a lot of money on booze, birds and fast cars. The rest I just squandered.
George Best
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laptoprob
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| posted on 29/3/13 at 05:21 PM |
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quote:
Originally posted by Worzey
Just heard back from RAW on the dyno results for my car now that the Rotrex Supercharger has been fitted.
It made 260bhp on the rollers :-)
On RAW's advice we've reduced the boost so it makes a comfortable 240bhp. The rev limiter has also been reduced to 7,500rpm as an added
safety factor. That still gives it 420bhp/tonne
How did you reduce the boost? By changing the pulley?
[Edited on 29/3/13 by laptoprob]
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Worzey
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| posted on 29/3/13 at 06:31 PM |
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Sorry, my mistake.
The option of reducing the pulley was discussed to lower boost but in the end the timing was retarded slightly to reduce power. Boost remained the
same.
Caterham R400
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laptoprob
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| posted on 29/3/13 at 08:30 PM |
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quote:
Originally posted by Worzey
Sorry, my mistake.
The option of reducing the pulley was discussed to lower boost but in the end the timing was retarded slightly to reduce power. Boost remained the
same.
Ahh interesting, i had visions of me taking various pullies to the rolling road lol
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R1_striker
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| posted on 29/3/13 at 09:28 PM |
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quote:
Originally posted by bi22le
I expected more
Good times, now time to get out and use it in anger. By the way, using 4AGZE rods and pistons will strenthen the bottom end but also lower the CR.
Maybe a cheaper alturnative to the £1K pistons and rods.
I bet it sounds good too. Any videos?
Just a quick note, 4agze are 16v so pistions are no goog for 20v not enough cut outs in the top. Sorry just thought I'd say.
Also I believe raw use mek Motorsport for their rolling road needs.
Your going to need a striker to handle that power now lol (sorry had to add that)
Have fun
small tax, small insurance, huge laughs
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Worzey
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| posted on 30/3/13 at 06:41 AM |
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I'd love a Striker, so much nicer than the Velocity and a much smaller package. Maybe I'll use my car as a doner in a few years
Caterham R400
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