Chipping a Suzuki 140HP???

Mrdeli · 20 March 2006, 13:14

Can anyone tell me whether it's possible to re-map or retune a 140HP Suzuki (four stroke) to produce more power.

I know there's lots of places that remap ECU's for cars... is there anyone who does this for outboards.

Regards

Mark

Nick Hearne · 20 March 2006, 15:39

I think you may have problems as at 140HP this engine is being pushed & is going to be sold as a 135HP with the new 150HP coming out!

Alice · 20 March 2006, 16:17

Quote:

Originally Posted by Nick Hearne

I think you may have problems as at 140HP this engine is being pushed & is going to be sold as a 135HP with the new 150HP coming out!

According to Roycruse who runs a 140 Suzook, they actually put out 127hp.

Mrdeli · 20 March 2006, 18:06

Hell fire... no wonder she's not getting past 50MPH.

The max engine weight is 195kg / 429lbs for my boat....

What other options are there to perk her up a little?

Lets presume that all will be well at say 205kg.... I think the 150 hp suzuki is heavier than that. Other makes anyone?????

Regards

Mark

roycruse · 20 March 2006, 18:11

Im only relaying what i heard - i cant remember who said it but someone aparently had "official" info that the DF140 had been dyno'ed at 127.

I'd still recommend one though - reliable, quiet, efficient, light - im certainly not crying over 13HP if indeed the reports are true.

Other people have said that the engine will be rebadged at 130 or 135 but its all hear say at the moment - they have not done it so far...

Millermob · 20 March 2006, 18:11

evinrude e-tec 150/175/200 comes in at 194 kg

roycruse · 20 March 2006, 18:12

Quote:

Originally Posted by Mrdeli

no wonder she's not getting past 50MPH.

What Prop are you using and what RPM are you at when you reach 50mph ???

Mrdeli · 20 March 2006, 18:17

With 2 up, I'm hitting an indicated 6300 rpm (i think top end is meant to be 6200) and that using a standard aluminium 14 x 21 prop. It's just touching 50MPH. Any suggestions?

roycruse · 20 March 2006, 18:21

Suzuki 14 X 22 stainless prop will get you another 2 or 3 mph - you might also get away with a solas titan HR3 13 7/8 X 23 for an extra 5 mph

but you will start to loose revs and speed when you load up so i would only recomend that if 2 up is your normal load...

Alice · 20 March 2006, 18:38

Be careful with over-propping, I've been there. You'll end up with a bit more top end (which is used rarely) at the sacrifice of pull out and general performance. I'd stick with the 21" or 22" max. You could end up with a load of friends in the boat and not being able to get it planing.

roycruse · 20 March 2006, 18:43

Suzukis have loads of torque and a big gear ratio.

Mine will pull my 20 stone lump out of the water on a wakeboard with 5 adults and 2 kids on board with a 21" prop - not like those wussy optimax 2 strokes

roycruse · 20 March 2006, 18:48

Ive also had 8 adults and 2 kids on board on a trip to fowey and it was fine also...

I would say if your over revving to 6300 you can definately go up a prop size - stainless will make quite a bit of difference as well - lower drag, sharper blades

Alice · 20 March 2006, 18:49

Wussey?!! Cheeky git

I tried a 23" on my Rinker which had a 260hp Merc V8 throwing it around. The 21" was perfect, with a 23" it really struggled to pull out. It didn't half fly when we did get it up.

ADS · 20 March 2006, 18:58

Quote:

Originally Posted by Alice

Wussey?!! Cheeky git

I tried a 23" on my Rinker which had a 260hp Merc V8 throwing it around. The 21" was perfect, with a 23" it really struggled to pull out. It didn't half fly when we did get it up.

Have you ever been to Cornwall Alice?

Mrdeli · 20 March 2006, 21:14

I've ordered a 21" Solas Stainless Steel prop... figured I wanted to keep mid range grunt

jwalker · 20 March 2006, 22:20

roycruse · 21 March 2006, 07:55

Quote:

Originally Posted by Mrdeli

I've ordered a 21" Solas Stainless Steel prop... figured I wanted to keep mid range grunt

I have just switched from a 21" standard ally to a 21" stainless - it gave me just over 100 extra rpm and a couple of extra knots. I think if you were already at 6300 you may find you are now hitting the rev limiter - which on a suzuki is a right pain in the arse as it will cut your revs to 3000rpm and will not allow any more until you return to idle for 1 second - only then can you throttle back up...

Mrdeli · 21 March 2006, 12:42

Maybe i'd better get a 22 or 23 then...

I certainly don't want to be down at 3000 rpm... that's for sure!

roycruse · 21 March 2006, 14:23

Unfortunately with props you either have to be lucky - or if your not lucky - persevere.

You have the same engine as me - but your boat must be lighter or your hull faster as i was only getting 6000rpm with the standard ally prop - now i have the stainless i feel its perfect.

It also depends alot on the other characteristics of the prop ie cuping, rake, blade area, etc... so im afraid i cant really help you other than tell you my experiences - it could be, for instance, that the stainless you have ordered has alot of cupping and you will get no rpm increase at all !!!

Hugh Jardon · 21 March 2006, 14:28

Quote:

Originally Posted by roycruse

if you were already at 6300 you may find you are now hitting the rev limiter - which on a suzuki is a right pain in the arse as it will cut your revs to 3000rpm and will not allow any more until you return to idle for 1 second - only then can you throttle back up...

nice feature for keeping the engine with a longer life but could be a safety issue in extreme circumstances.