ReplaceDisplace

I've recently supercharged my VVT engine. Running a megasquirt DIYPNP Soon I'm going to purchase larger injectors and a smaller pulley. (62.5 mm) I have a power goal of 195-205 HP I think the pulley should allow me to make around 10psi which should get me to my power goal. The supercharger is intercooled. I've read that max safe power on a VVT engine is around 220 or so. It then occurred to me that to make 200 wheel horsepower the supercharger will be using quite a percentage of engine power thus requiring the engine itself to produce over 220 hp to achieve 200 whp The car is running a stock engine and I want to maintain engine safety and reliability even at the cost of power. So I suppose my question is this, is 200 whp safe for the engine or should I lower my power goal slightly in the name of safety? Any advice is welcome. Thanks in advance.

TorqueZombie

iTrader: (6)

Superchargers don't "take" power. More of an opportunity lost. 200whp will be fine as long as you don't magically find a way to make 300wtq.

good2go

iTrader: (2)

I think you'd be fine at 200 whp. As mentioned above, wtq (rear wheel torque) is more of an immediate concern than whp. From what I've gathered, 250 wtq is a threshold for the stock connecting rods. You will undoubtedly be well below that, even if you include the added parasitic load of the SC.

May I suggest that you consider keeping your stock SC nose pulley and looking into the option of using a 150mm crank overlay pulley to increase boost instead. There is a factor of diminishing returns on those smaller pulleys when used with a 4 rib belt (assuming you have one); you're asking for more and more load to be placed upon a smaller surface area. Belt slip becomes fairly imminent when you get up to your intended power levels.

ReplaceDisplace

I was really hoping I could just swap the pulley...in order to come up with the same ratio, I'd have to purchase the 200 dollar overlay pulley and still a different supercharger pulley.

I discussed my power goals with Gary at TDR and he seemed to think my power goal was ok with the 4-rib and the pulley swap. I wouldn't mind going to a 6-rib but so far it's been rather unclear to me as to how to do that.

jeff_man

iTrader: (7)

Hello person with not clue what they are doing.

Stock 02 with mp62, 62mm pulley(11ish psi), 305cc and popopo-powercards got me 190hp.

stock 02 block and trans are good for the 250 range but would not go over that. Having a good smooth tune helps it not brake apart.

I'm putting down 250whp/215ftlb range now on a 99 block, 01 trans with a 65mm pulley (8-9 psi).

Have only used a 4 ribs and stop crank pulley.

Oscar

iTrader: (2)

Add some cooling fins to the IC pipes poking through the hood for dem extra low intake tempz.

Also, 325.21 is max power.

ReplaceDisplace

Indeed

ReplaceDisplace

sixshooter

iTrader: (12)

What was the question, exactly?

ReplaceDisplace

My question was whether on not 200 whp is a safe goal on a superchargered 01-05 engine. Thanks for the response.

sixshooter

iTrader: (12)

Yes. Very safe with a good tune.

jeff_man

iTrader: (7)

Your full of ****, if my motor didn't blow up making that on powercards then you could make that much safe with a.... **** I don't have anything witty to compare powercard to along the lines of a child with an abacus and barometric pressure sensor.

muoto

aaah good old powercards. Brings out memories. Two years with MP62 and powercards = two broken engines

MINI-P

Dang, Jeff, why the hate, bro?

I made a little over 200 whp @ 10 lbs boost, 4 rib belt, stock internals on a powercard as well and never had an issue. Mine nor Jeff's cars are VVT. Don't know if that makes a difference. Now I did grenade a 5 speed transmission at that power. But that coulda just as easily been operator error as I was just learning to drive at the track.

You gonna yell at me too, Jeff?

concealer404

iTrader: (3)

P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P

Leafy

iTrader: (1)

C-C-C-C-C-C-C-C-COMBO BREAKER

Yes 200 is probably safe, since if I remember the MP62 data correctly at 200hp its requiring ~30-40 hp from the belt to drive it, so your rods, piston, and crank are experiencing ~240hp, but its only showing up on the dyno as 200.

concealer404

iTrader: (3)

No no no no you ruined it!



P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P

Godless Commie

iTrader: (2)

Get a 6 rib belt, order tensioner 38178 from Dayco, install with proper adapter you can source from Tom or Gary, and do not look back.
200 whp on a stock engine is OK.

DO NOT go for the 150mm pulley. I did, and promptly fuggered up my blower.

concealer404

iTrader: (3)

I hate all of you.

good2go

iTrader: (2)

Hmm, I'm assuming you must have a BRP type kit then, right? I don't recall any 6-rib setup, let alone with an auto-tensioner, being available for the later generation Moss/TDR hotside kits, other than custom one-offs.

I am curious why that overlay pulley messed up your blower though. Were you already running a really small nose pulley when you added it, or what?

The overlay always seemed like the lesser of evils if you were stuck with no auto-tensioner and a 4-rib setup, as you could retain more belt traction by keeping a larger nose pulley in conjunction with the overlay. Do you think that is not so?




Sorry