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| 16V running like a Turbo ! | |
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| Tweet Topic Started: Mon May 7, 2012 3:20 am (1,051 Views) | |
| wowow | Mon May 7, 2012 3:20 am Post #1 |
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Part of things
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my 16V behaves like a turbo ! when I floor the pedal 80% down from stand still, the car has very little torque. After it goes past 4k rpm, power starts coming like a turbo and continue all the way up to 6.5k ( I seldom go past 7k ). Sometime I find the it hard going up a slope even on first. On second, at the slope, the car almost stall. It behaves the same on 2nd, 3rd, 4th. Very little power even when I floor the pedal, but after 4k, all power comes in. It feels like not all cylinders are running when the car is below 4k, hence no power, and everything comes to life after 4k. ENgine was rebuilt not long ago and compression is good, spark plugs are healthy. Injectors are quite new. My take is the distributor. I think fuel is not evenly distributed to all 4 cylinders because some "nozzle"is blocked ? During low rpm, some of the injectors are not getting fuel, and once reached 4k, they all have fuel and hence power. But why would fuel flows better when reaches higher rpm ? Maybe my theory is wrong. The fuel pump is quite new, and if it is not having enough pressure, none of the cylinder would have gotten any fuel, so I rule that out... Help needed |
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| chrismatheou | Mon May 7, 2012 3:35 am Post #2 |
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Enthusiastic Bad Boy
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That's how they all are! If you want power keep the revs up, they are high revving engines, just warm the oil up nicely before you give it some
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| Cosworth | Mon May 7, 2012 5:44 am Post #3 |
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More than part of things
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Do a compression check first, very easy and simple. Then check the fuel pressure, you might have a problem with fuel regulator. |
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| jeremy | Mon May 7, 2012 7:50 am Post #4 |
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Too Far Gone To Help
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Typical 16V behaviour , not much below 4-4 1/2 k revs , after that is where the excitement is . On the track you have to ensure the revs are kept up above 4K all the time . All part of the fun. Jeremy |
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| gibpetrolhead | Mon May 7, 2012 8:05 am Post #5 |
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Racing line
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+1, although you say you don't get past 6.5k you should get to just over 7k then the limiter kicks in!. |
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| stwat | Mon May 7, 2012 11:19 am Post #6 |
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It certainly shouldn't struggle up hills/slopes. Mine was surprisingly torquey and could pull up quite steep hills even in 5th gear. Obviously all the power comes in after 4k but you should still have enough torque at lower revs. |
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| wowow | Mon May 7, 2012 4:48 pm Post #7 |
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Part of things
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Thank you all for your comment. I agree that once the 2516 goes past 4k, it's very sweet! I also notice that the power is way better once the car is warmed up. I also have an e30 m3, which is also a 16v engine, but the low end torque is so much better but top end is not as powerful as the 2516. I am surprised they perform so differently. Were they designed to tackle different type of racing ? |
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| II.V - I VI | Tue May 8, 2012 12:02 pm Post #8 |
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Part of things
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They were designed to tackle the same type of racing, but there are some differences with the E30 M3. What I have experienced (having driven both cars) is that the M3 has a bit more power. Andronikos |
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| Will | Tue May 8, 2012 12:53 pm Post #9 |
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Highly Addicted
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What are the compression figures, and have you checked the valve clearances? Whilst the 16v engine certainly makes most of the power up in the revs, they should still pull strongly from lower revs too. Normally when they are tired and losing compression the low end power suffers. Even with quite poor compression these engines can seem to run fairly well with no blindingly obvious signs unless you have experienced a few and know how they should run and pull. After I rebuilt the last 16v I had, it would pull positively from 2-3k and still had plenty of power near to the red line, but without the noticably flat bottom end. The 'surge' if you like was less obvious, but was clearly more powerful throughout and quicker to drive. |
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| wowow | Tue May 8, 2012 1:12 pm Post #10 |
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Part of things
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The compression is fine as the engine was recently rebuilt with new valves and pistons...etc. The are very few 16v around so I have no idea how it should run in its "proper" state. |
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| Paulossie | Tue May 8, 2012 10:18 pm Post #11 |
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Potato
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I rebuilt my 2.5 auto and it pulls like a train in the low revs like will says, but when you let it rev right out it flies now, but I dont get a step like a tubo its smooth and the power comes on progrssivley throughout the revs. |
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| stwat | Tue May 8, 2012 11:38 pm Post #12 |
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Yup, as I said before, they should never feel underpowered at low revs when in a good state of tune. The chap that bought mine was very surprised at how much torque it had low down, as he had been(wrongly) led to believe they were totally gutless below 4k. |
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| wowow | Wed May 9, 2012 3:28 pm Post #13 |
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Part of things
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i must spend more time on testing mine then. Anyone has a dyno graph on a "normal" 2.5-16 ? I might go for a test just to comapre how bad mine is, if there is something to compare to |
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| gibpetrolhead | Wed May 9, 2012 4:17 pm Post #14 |
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Racing line
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Might be an idea for someone close to you with 16v experience to get a run in yours to offer an opinion!. |
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| Paulossie | Wed May 9, 2012 6:52 pm Post #15 |
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Potato
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I'm in Cheltenham if you want a go in my auto 2.5 |
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| wowow | Thu May 10, 2012 5:20 pm Post #16 |
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Part of things
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Thanks, Paulossie, but I am in Hong Kong :-( |
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| Paulossie | Thu May 10, 2012 11:17 pm Post #17 |
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Potato
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Ah, oh well I would love to visit Hong Kong. |
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