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Join Date: Jul 2009
Posts: 49

E15 Engine

08/10/2009 8:38 PM

hey ive got a stock E15 engine caburated in a nissan sentra can i just install the E15 engine turbo to it without doing any forms of modifications like changeing pistons etc or will i have to do modifications if i do what will the modifications be?

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Join Date: Oct 2008
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#1

Re: E15 engine

08/11/2009 4:55 AM

Pistons, at least. Look at a "hot rodding a nissan e15 site or two.

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Anonymous Poster
#2

Re: E15 Engine

08/11/2009 6:36 PM

There's a trade off that you have to consider. It invovles engine compression and how it affects turbo lag (time it takes the turbo to spool up) and turbo efficiency.

A lower the compression ratio will cause a longer the turbo lag and higher turbo efficiency. Your car will take longer to get to full power but will be able to put out more power.

A higher the compression ratio will reduce turbo lag but decrease turbo efficiency. Your car will get to full power but will not be able to put out as much power as a lower compression engine.

Normally a compression ratio of 6.5:1 to 8:1 is ideal for a turbo engine. I beleive the compression ratio for a stock normally aspirated E15 is 8.5:1. Hope this helps.

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Anonymous Poster
#3

Re: E15 Engine

08/11/2009 7:56 PM

Where to start? First the compression ratio must be lowered either by changing pistons or changing cylinder head to one with a larger combustion chamber. Second the cam needs to be one with a bit less overlap so that you don't just blow through the chamber while the valves are open. Then you need to modify the carb because the jets, power valve and even the chokes will be all wrong for a turbo. Now comes the oiling system as the turbo will add tons of heat to the lubricant. Cooling system and transmission along with the rear end will all have to be beefed up if you want your car to hold together. I am a 35 year heavy line tech with tons of formula racing experience if you would like to chat here is my Email: johnd7618@cox.net

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Location: Northern NY
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#4

Re: E15 Engine

08/12/2009 9:15 AM

Typically when adding a turbo to a naturally aspirated Diesel engine, the designers beefed up the oiling and cooling systems at least. This often included "pee pipes" to spray oil on the underside of the pistons to give them added cooling which is needed due to the extra heat input. If this selfsame engine came in both naturally aspirated (NA) and turbo'ed versions, I'd check to see if there were any differences in the basic engine between the NA and turbo versions, i.e., improvements in oiling which would include greater sump capacity, oil pump flow rate, maybe an oil pressure increase, increased filter capacity and improvements that may also extend to the basic engine block, including pee pipes. If you just slap a turbo on willy-nilly, you run the risk of an engine meltdown due to excess heat input. A lot of farm tractor pullers did that, but sometimes the engine didnt hold up.

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