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Old 21-03-2007, 07:36 PM   #1
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300 vs 300x

I have been told the only difference between the 300 and 300 x is the ECU. Anyone actually know?
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Old 21-03-2007, 08:01 PM   #2
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I don't know much details but I know its alot more than that. Block is different for starters!!!
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Old 21-03-2007, 08:11 PM   #3
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OK, so its the 300x and 300xs that has the different ECU?


What do you know about the 300? vs the 300x?? I am looking for any helpful information.
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Old 21-03-2007, 08:33 PM   #4
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Originally Posted by verytricky View Post
OK, so its the 300x and 300xs that has the different ECU?


What do you know about the 300? vs the 300x?? I am looking for any helpful information.
300 is a 3 litre, 300x and 300xs are 3.2 litre but its more than just the ECU thats different between them. I dont think there even the same cc.
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Old 21-03-2007, 08:55 PM   #5
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300x isn't a 3.2 litre its a 3.0 litre
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Old 21-03-2007, 09:43 PM   #6
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Quote:
Originally Posted by verytricky View Post
I have been told the only difference between the 300 and 300 x is the ECU. Anyone actually know?
Dude do a search on the forum, Ive posted about the 300 and 300x a few times.
The 300p.m is a 3.0l EFI block
the 300x is a 3.0l Optimax block(efi aswell)
and the 300xs is a 3.2l duel stage direct fuel injection
As i understand the 3.2 is the same bore as the 3.0 except has a longer stroke.
in answer to your question Marc, no the 300x has different block, ecu, intake, etc.
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Old 22-03-2007, 09:12 AM   #7
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............. and the "X" has 15 or more hp advantage! - I know where there is a brand new one I think!
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Old 22-03-2007, 11:48 AM   #8
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I am in the process of re-assembling my two 300's. I was wishing to get a little more power out of them, so I dont want to buy a new one.....

Geoff says the powerheads are mint. They have under 50 hours on them and they are hardly run in yet, basically because of the wrong prop they never revved over 5000 so I dont want to mess with them too much. I was hoping for a ECU fix or something similar....

The engines should be back together and on the boat again in under a month!
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Old 22-03-2007, 11:53 AM   #9
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I think as said above, the differences between the 300 & X are significant.

I believe the X block is actually a 3 litre opti block.
I reckon this raises an interesting tuning option - taking a 300xs powerhead and de-opti-ing it - could be potential for a very powerful motor.
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Old 22-03-2007, 07:11 PM   #10
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Quote:
Originally Posted by Cookee View Post
............. and the "X" has 15 or more hp advantage! - I know where there is a brand new one I think!
nope,
300x is 300 hp at the prop (or as many people describe 325)
pre 2000 300 promax's were 275
post 2000 300 promax's were 300 due to having different intake, ecu and a couple other things.
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Old 22-03-2007, 07:20 PM   #11
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Quote:
Originally Posted by verytricky View Post
I am in the process of re-assembling my two 300's. I was wishing to get a little more power out of them, so I dont want to buy a new one.....

Geoff says the powerheads are mint. They have under 50 hours on them and they are hardly run in yet, basically because of the wrong prop they never revved over 5000 so I dont want to mess with them too much. I was hoping for a ECU fix or something similar....

The engines should be back together and on the boat again in under a month!
dude theres loads you can do to them,
depends how much you want to spend.

MAD EFI INTAKE
MAD EFI EXHAUST TUNER
MAD EFI SHORTSHAFT (MERC DONT MAKE ONE)
MAD EFI BILLET TIMING
MAD EFI CUT HEADS 62 CC
SIMON MOTOR SPORTS DRYSTACK
MAD EFI CUSTOM RECURVED IGNITION WITH 7500 RPM LIMITER
MAD EFI CUSTOM RECURVED FUEL ECU

thats what we have, but you can get more,such as:
3.4 big bore kit,
xxx intake
MSD ignition
light flywheel
simon motorsports heads
forgies
crank case skimmed

how much you looking to spend?
bolt ons or you looking to go into the engine?
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Old 22-03-2007, 07:30 PM   #12
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Quote:
Originally Posted by Matt View Post
I think as said above, the differences between the 300 & X are significant.

I believe the X block is actually a 3 litre opti block.
I reckon this raises an interesting tuning option - taking a 300xs powerhead and de-opti-ing it - could be potential for a very powerful motor.
I was speaking to simon about us fitting the 300xs crank into our engine as it has a longer stroke
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Old 23-03-2007, 09:32 PM   #13
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Originally Posted by PuppiesBalls View Post
nope,
300x is 300 hp at the prop (or as many people describe 325)
pre 2000 300 promax's were 275
post 2000 300 promax's were 300 due to having different intake, ecu and a couple other things.
Not entirely convinced by that cus everyone I have ever spoken too and all the posts on here and 'scream and fly' that I've seen (other than yours) have indicated 317hp at the prop.

Show me dyno results or something!!!
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Old 24-03-2007, 10:54 AM   #14
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Quote:
Originally Posted by Johnny Boat Dude View Post
Not entirely convinced by that cus everyone I have ever spoken too and all the posts on here and 'scream and fly' that I've seen (other than yours) have indicated 317hp at the prop.

Show me dyno results or something!!!

I agree here I was always lead to believe the 300x was more like 315 at the prop too, this is why it was excluded from f2 in skiracing in the uk
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