1.6 power

[Ab Shocks]

You guys might remember I was looking to get the old Gazmobile up from the not great 90bhp at the wheels and with tweeking down at Atspeed got up to the giddy heights of 95bhp atw with a decat.

Well, yesterday my little mates at Ma5da racing put a skimmed head with 3 way cut valves on the car and I rolling-roaded it today back at Atspeed..... 99.9 ATW with no tweeking, not bad but with a live tune on the timing and airflow we got 107.1 atw

Thats a very good gain of 17bhp atw and I'm really chuffed.

[Howard-]

Nice, two questions..

1) How much did this cost
2) What are the flywheel figures?

[MX-5 Lazza]

Losses are usually about 30-35bhp.

[Ab Shocks]

Howard- said:

Nice, two questions..

1) How much did this cost
2) What are the flywheel figures?

1) about £650 unless you go for new followers, I'm old school, noisy tappets are happy tappets LOL
2) That is a more difficult question because drivetrain losses are nearly as big a can of worms as "which suspension"?. 18% to 22%, take your choice.
Somewhere between 130bhp and 135bhp is probably close to the mark

[Howard-]

I like flywheel figures, we're measuring the engine, not the gearbox

That's quite an impressive gain on the 90bhp engine though Fancy giving my 1990 1.6 the same treatment?

[J-Tuner]

Ab Shocks said:

You guys might remember I was looking to get the old Gazmobile up from the not great 90bhp at the wheels and with tweeking down at Atspeed got up to the giddy heights of 95bhp atw with a decat.

Well, yesterday my little mates at Ma5da racing put a skimmed head with 3 way cut valves on the car and I rolling-roaded it today back at Atspeed..... 99.9 ATW with no tweeking, not bad but with a live tune on the timing and airflow we got 107.1 atw

Thats a very good gain of 17bhp atw and I'm really chuffed.

Thats good going Derek - nice one ! I drove it twice at Combe at japfest (thanks again!) and thought it went well as it was for a 1.6 (i was keeping station behind that impreza turbo)but this should make a nice improvement !

Are you coming along to the WiM day sunday ? I sold the 200sx and bought myself a MK1 1.8 in silver about a month after you let me drive yours! Bad man !!

Steve

Edited by J-Tuner on Friday 4th September 09:00

[nfo]

Howard- said:

I like flywheel figures, we're measuring the engine, not the gearbox

Ultimately wheel figures are what matters though. Without taking the engine out of the car and running it on a proper dyno, accurately measuring the flywheel power is impossible (despite what people might have you believe). 'Flywheel' figures from a rolling road/'chassis dyno' are at best an educated guess, at worse utter guff. (see http://www.pumaracing.co.uk/coastdwn.htm)

Either way, good work, that's a decent increase

[MX-5 Lazza]

Howard- said:

I like flywheel figures, we're measuring the engine, not the gearbox

But we're not measuring the engine unless you take it out of the car and run it on an engine dyno. Rolling roads measure the power/torque at the wheels and then calculate the flywheel figure from drivetrain losses (measured from run-down but still a bit hit & miss).

Howard- said:

That's quite an impressive gain on the 90bhp engine though Fancy giving my 1990 1.6 the same treatment?

Read it again - he said 90bhp at the wheels

DOH! nfo beat me to it!
I will add though that my car has been dyno'd at Surrey Rolling Road at 226whp and at AFR Tuning at 253whp with no changes to the car between runs. I normally stick with SRR and quote their figures though as SRR are well respected and regarded as being pretty accurate.

Edited by MX-5 Lazza on Friday 4th September 10:06

[Howard-]

MX-5 Lazza said:

Read it again - he said 90bhp at the wheels

Whoops

[Ab Shocks]

J-Tuner said:

Ab Shocks said:

You guys might remember I was looking to get the old Gazmobile up from the not great 90bhp at the wheels and with tweeking down at Atspeed got up to the giddy heights of 95bhp atw with a decat.

Well, yesterday my little mates at Ma5da racing put a skimmed head with 3 way cut valves on the car and I rolling-roaded it today back at Atspeed..... 99.9 ATW with no tweeking, not bad but with a live tune on the timing and airflow we got 107.1 atw

Thats a very good gain of 17bhp atw and I'm really chuffed.

Thats good going Derek - nice one ! I drove it twice at Combe at japfest (thanks again!) and thought it went well as it was for a 1.6 (i was keeping station behind that impreza turbo)but this should make a nice improvement !

Are you coming along to the WiM day sunday ? I sold the 200sx and bought myself a MK1 1.8 in silver about a month after you let me drive yours! Bad man !!

Steve

Edited by J-Tuner on Friday 4th September 09:00

Yep, I'll be there

[Ab Shocks]

MX-5 Lazza said:

I will add though that my car has been dyno'd at Surrey Rolling Road at 226whp and at AFR Tuning at 253whp with no changes to the car between runs. I normally stick with SRR and quote their figures though as SRR are well respected and regarded as being pretty accurate.

Edited by MX-5 Lazza on Friday 4th September 10:06

Very good point Lazza, I also know that Charley is one of the good guys from comparrisons on the many rolling road sessions I have had round the UK
I would add Atspeed in Southend, Crazy Horses in Borehamwood, Mike at Congleton and Julian Lane in Chesterfield to the approved centres.
I have seen the BS at first hand on our BMW cars, like 143bhp at the fly in a well known tuner local to us that transposed to 126 at Atspeed a week later.